Assume that peek$(),$ pop$(),$ push$(),$ printStack$()$ methods are defined in the Stack class. Also Node class is defined.

Find the correct output:

stack.push $(10)$;

stack. push $(20)$;

stack. pop $()$;

stack. push $(50)$;

stack. push $(40)$;

stack. peek$()$;

stack. push$(100)$;

stack.printStack$()$;