Which of the following methods may be used to trade exchange traded funds (ETFs)?

1. Investors can buy or redeem shares from the fund family in lots of 1,000.

2. Investors can trade ETFs in the secondary market by using a broker.

3. ETFs can be purchased on margin.

4. ETFs may be sold short.

A. 2

B. 1, 2

C. 1, 3

D. 2, 3, 4