Let A = {Monday, Tuesday, Wednesday, Thursday, Friday}.  Which of the following are true?  There are three correct answers; select all three correct answers.多项选择题

A

Monday is an element of A.

B

Monday is a subset of A.

C

{Monday} is an element of A.

D

{Monday} is a subset of A.

E

The empty set is an element of A.

F

The empty set is a subset of A.

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