Which of the following is correct?...

Which of the following is correct?

A

`{7}in{1,2,3,4,5,6,7,8,9,10}`

B

`7in{1,2,3,4,5,6,7,8,9,10}`

C

`7!in{1,2,3,4,5,6,7,8,9,10}`

D

`{7}cancel(sube){1,2,3,4,5,6,7,8,9,10}`

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