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Write a C program named "countC.c" taking input text file as arguments and count the characters for that text file according to the following requirements. (If no text file is given, countC will read the input from default text file "test.txt") You need to use fork to duplicate the processes. The parent process needs to output the most frequent letter and display how many times that letter appears. And please create n child processes (n>-3) and assign each process a task according to the indexi is from 0 to n-1 but NOT PID). If i%3--0, it should output the number of digits in the text file. If 1963-=1, it should output the number of letters in the text file(IGNORE CASE). If 1963-=2, it should output the number of white spaces in the text file. (For details, please refer to the example attached) Below are sample runs of countC.c (assuming countc is the generated executable file): Scat test.tx This is a list of courses. CSC 1010 COMPUTERS & APPLICATIONS S./countC Most frequent letter is 's', it appeared 8 times 0-Number of digit-4 2--Number of space 12 1-Number of letters 44 Notes: 3 child processes are created in this example, and '0', '1, '2' are the indexes of the processes. n counting the letters. Try to create 10 processes and see what is the output. In your output, the order of those indexes may be different from this example. Write a C program named "countC.c" taking input text file as arguments and count the characters for that text file according to the following requirements. (If no text file is given, countC will read the input from default text file "test.txt") You need to use fork to duplicate the processes. The parent process needs to output the most frequent letter and display how many times that letter appears. And please create n child processes (n>-3) and assign each process a task according to the indexi is from 0 to n-1 but NOT PID). If i%3--0, it should output the number of digits in the text file. If 1963-=1, it should output the number of letters in the text file(IGNORE CASE). If 1963-=2, it should output the number of white spaces in the text file. (For details, please refer to the example attached) Below are sample runs of countC.c (assuming countc is the generated executable file): Scat test.tx This is a list of courses. CSC 1010 COMPUTERS & APPLICATIONS S./countC Most frequent letter is 's', it appeared 8 times 0-Number of digit-4 2--Number of space 12 1-Number of letters 44 Notes: 3 child processes are created in this example, and '0', '1, '2' are the indexes of the processes. n counting the letters. Try to create 10 processes and see what is the output. In your output, the order of those indexes may be different from this example