What is the output of this program?

#!/bin/sh
demo_function() {
    echo "Welcome to the Example"
    printf "World of Linux\n"
}
unset -f demo_function
demo_function
exit 0

A. countw B. wcount C. wc D. count p E. None of the above

A. dm B. rm C. delete D. erase E. None of the above

A. rdir B. remove C. rd D. rmdir E. None of the above

A. x B. y C. a D. z E. None of the above