Which of the following is equivalent to the set {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}?

(you may select more than one)

Question 4 options:

{x | x is one of the seven wonders of the ancient world}

{x | x is one of the six nobel prize categories}

{x | x is the number of humans who can breathe unassisted underwater}

{x | x is a letter of the alphabet

{x | x is one of the two lead singers of Van Halen}

{x | x is a day of the week}