Exam MB-400 topic 2 question 3 discussion

You have the following code:

You have a contact record that uses the GUID 2CFB1599-DEAD-425F-AB4A-76E6CAB51B09.
You need to assign the contact record as the primary contact for an account when you create the account.
Which two code segments can you use? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.
A.

B.

C.

D.