Which One of the Following Statements Is Correct About a Good-'Til-Cancelled

Which one of the following statements is correct about a good-'til-cancelled order?

A) The order generally expires after six weeks.
B) The order will automatically renew unless cancelled by the customer.
C) The order helps customers obtain a specific price without watching the market continuously.
D) The order will be cancelled at the end of the trading day if not executed.