Is this right explanation to the given code?

void *calloc(size_t n, size_t size) 
#n -- This is the number of elements to be allocated.
#size -- This is the size of elements.

A. strlen() B. strlength() C. stringlen() D. strsize()

A. To print formatted text to the standard output B. To read text from the standard input C. To open a file D. To close a file

A. math.h B. stdlib.h C. cmath.h D. algorithm.h

A. Compares two strings and returns an integer indicating their relationship B. Copies one string to another C. Concatenates two strings D. Searches for a substring