Determine whether the statement is true or false. Chose best answer.

{1,3,7} = {1,1,3,7,7}

a. False. The sets do not have the same cardinality.

b. True. Both sets contain the same elements.

c. False. All elements in the first set should be duplicated in order for the sets to be equal.

d. False. Some elements of the first set are duplicated in the second set.