What will be the output of the following Python code?

a = ('check',)
n = 2
for i in range(int(n)):
    a = (a,)
    print(a)

A. List B. Tuple C. String D. Dictionary

A. insert() B. add() C. append() D. push()

A. Returns the length of the list or tuple B. Converts the list or tuple to lowercase C. Converts the list or tuple to uppercase D. Removes the last element

A. append() B. add() C. insert() D. extend()