Which statement is false?

a) Function strcpy copies its first argument into its second argument.
b) Function strncpy does not necessarily copy the terminating null character of its second argument.
c) A common error is not appending a terminating null character to the first argument of a strncpy when the third argument is less than or equal to the length of the string in the second argument.
d) The first character of the second argument of strcat replaces the null character that terminates the string in the first argument.

a) Function strcpy copies its first argument into its second argument.