One Difference Between Open-End and Closed-End Funds Is That

One difference between open-end and closed-end funds is that

A) open-end funds have no maturities,while closed-end funds are dissolved after a given number of years.
B) shares of an open-end fund are bought and sold directly from or to the fund,while closed-end shares are bought and sold like the shares of any corporation.
C) open-end shares can be purchased by the general public,while closed-end shares are available only to fund directors.
D) closed-end funds control and manage open-end funds.