⟩ What is the output of this program? #!/bin/sh san_function1() { a=5 echo "This is the first function" san_function2 } san_function2() { echo "This is the second function" san_function3 } san_function3() { echo "This is the third function" } san_function1 exit 0 a) This is the first function This is the second function This is the third function b) This is the first function This is the third function This is the second function c) This is the second function This is the first function This is the third function d) This is the third function This is the first function This is the second function