The correct answer is A. Blind carbon copy.
BCC stands for Blind Carbon Copy. It is a field in an email header that allows you to send a copy of an email to someone without the other recipients knowing. This can be useful if you want to keep someone informed of an email conversation without them being directly involved.
Carbon copy (CC) is similar to BCC, but the other recipients will see that the person you have CC’d has also received the email.
Basic carbon copy and basic common copy are not valid terms.