What will be the output of the following Python code?

def unpack(a,b,c,d):
    print(a+d)
x = [1,2,3,4]
unpack(*x)

Which of the following is the correct way to create an empty list in Python?

A. list()

B. []

C. empty_list()

D. list[]

What does the len() function do when applied to a list?

A. Returns the length of the list

B. Converts the list to lowercase

C. Converts the list to uppercase

D. Removes the last element

How can you add an element at the end of a list in Python?

A. append()

B. add()

C. insert()

D. extend()

What is the purpose of the list() constructor in Python?

A. Creates a new list

B. Converts a list to a tuple

C. Converts a string to a list

D. Creates a tuple