A={a,b,c,d} B={e,f} C. {b,a,c,d} D{1,2,3,4} what is the given statement a. Sets________and_______ are not equivalent and not equal. I can not seem to figure this out. Thanks for your help.

equivalent sets contain the same number of elements. sets a,b and b,c are equivalent.

Equal sets contain the same number and same elements a,b and b,a are equal

Set A and D are equivalent, but not equal
Set A and C are equal