Which of the Following Describes a Repo

Which of the following describes a repo?

A) Where a bank sells assets to person or institution A in return for buying assets from person or institution B
B) Where a bank sells some assets (e.g. bonds) and agrees to buy them back at a particular price after a set period of time
C) Where bank A lends to bank B provided that bank B is prepared to lend to bank A in the future
D) Where a bank agrees to buy certain assets from an institution for cash in return for being able to borrow from that institution in the future
E) All of the above