Question 5 Not yet answered Marked out of 1.00 Flag question Which format specifier is used if a variable named grade is declared as data type of character? O a. %s b. %lf O c. %d c O d. %c Question 6 Not yet answered Marked out of 1.00 P Flag question Which of the following is not a valid variable name? O a. Rate_value O b. Rate O c. Rate 10 O d. $rate Question 7 Not yet answered Marked out of 1.00 P Flag question What is the result of the following statements if used in a program? int a=3; float b=4.5; float c=b; printf("%f",c); O a. 1.50000 O b. 3 O c. 7.500000 O d. 4.500000