Which of the Following Is False About ETFs

Which of the following is false about ETFs?
ETFs are a type of open-end mutual fund.

A) ETFs can be purchased just like stocks from brokers or mutual fund families.
B) ETFs are similar to mutual funds in being passively managed and mimicking an index.
C) ETFs, like closed-end funds, are like stocks and can potentially trade below their net asset values.
D) As passively managed funds, ETFs have low annual expenses.