What are these and where am I?

Only amateurs call these things jellyfish. After all, fish have vertebrae and these critters don't. Fish don't usually sting; these beasts do. So exactly what are we looking at, and where is it? One more clue: This is an aquarium, and it opened in 1998.


1. What are these and where am I?
A. Chrysaora quinquecirrha, Aquarium of the Pacific, Long Beach, California
B. Mastigias papua, Maui Ocean Center, Hawaii
C. Illegitimi non carborundum, National Aquarium, Baltimore, Maryland
D. Phyllorhiza punctata, Monterey Bay Aquarium, Monterey, California
E. Carpe diem, Florida Sea Life Sanctuary and Restaurant Supply, Coral Gables, Fla.