What is the action of strcat() function?*1 pointcompare two stringsconcatenate two stringsfind the length of the stringcopies one string to another

Which of the following functions is used to concatenate two strings in C?strcat;strappend()strcat()strjoin()strmerge()

What is the first argument of the strcat() function in C programming?

Understanding strcat() functionWrite the correct output for the below C code?#include <stdio.h>#include <string.h>void main(void) { char str1[] = "Godavari"; char str2[20]; char str3[] = "River"; int i; i = strcmp(strcat(str3, strcpy(str2, str1)), "RiverGodavari"); printf("%d\n", i);}Output:

Which of the library function put back the length of a string?a.strlenb.strcatc.strcmpd.strcpy

What is string concatenation in C programming?