Hardest Mutliple Choice question ever, please help!

CFA Level III
#1

Suppose in the AM paper, you used pen and circled the wrong answer. Then, you realised it was the wrong answer and the correct answer should be the other one. What would you do?

A) Leave it and do nothing, what has been circled is kept

B) Put a cross on the circled wrong answer and circle the right answer

C) Cross all the options, write the correct answer and circle it

OR

D) Others, please suggest

#2

D) Circle with a pencil.

If there’s time left at the end, go through the questions and circle with a pen, but I assume pencil should be fine as well.

#3

B

#4

Def not A or C.