Which of the Following Is True About Matched Orders

Which of the following is true about matched orders?

A) Matched orders are completed through the NYSE.
B) A matched order is placing a buy order for one security for a set amount and sell order for another security for the same amount.
C) A matched order is a request that a security be purchased or sold at the current matched market price.
D) A matched order is executed by matching a buy order from one customer with a sell order for the same security from another customer.
E) Matched orders are completed through the over-the-counter market..