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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