c) A company's enforces rules for computer passwords. The password must contain:- - a minimum of 8 characters - at least one decimal digit (0-9) - at least one uppercase characters (A-Z) - at least one lowercase characters (a-z) Write a C function, named passwordcheck, which checks whether a C string is a valid password. The function passwordcheck has the prototype:- int passwordcheck( char * ); The skeleton of the function would be written as:int passwordcheck( char *input) \} or int passwordcheck( char input[]) \} The function accepts a string as the parameter and returns 1 if the string is a valid password or 0 otherwise. [10] Explain the difference between local and global variables. [2]