The Primary Difference Between Open-End and Closed-End Mutual Funds Is

The primary difference between open-end and closed-end mutual funds is

A) a closed-end fund does not stand ready to purchase its own shares when one of its owners sell them while an open-end fund does
B) both a closed-end and open-end funds stand ready to purchase their own shares when one of their owners sell them
C) a closed-end fund is typically traded on an organized exchange while an open-end fund is not
D) both a and c
E) both b and c