You have a stack named BooksStack that contains records of books. Each book record is represented as a list containing book_title, author_name, and publication_year.

Write the following user-defined functions in Python to perform the specified operations on the stack BooksStack:

1. push_book(BooksStack, new_book): This function takes the stack BooksStack and a new book record new_book as arguments and pushes the new book record onto the stack.

2. pop_book(BooksStack): This function pops the topmost book record from the stack and returns it. If the stack is already empty, the function should display "Underflow".

3. peep(BookStack): This function displays the topmost element of the stack without deleting it. If the stack is empty, the function should display 'None'.

1.

def push_book(BooksStack, new_book): 
  BooksStack.append(new_book)

2.

def pop_book(BooksStack): 
    if not BooksStack: 
        print("Underflow") 
    else: 
        return(BookStack.pop())

3.

def peep(BooksStack): 
    if not BooksStack: 
        print("None") 
    else: 
        print(BookStack[-1])