The correct answer is C. Add a person to the email without the main recipient's knowledge
Step-by-step explanation:
An electronic mail or email is a type of message sent using electronic devices such as computers or cellphones through the internet. This type of messages are widely used nowadays and offer multiple options such as including images or videos besides words as well as deciding who receives the message, this includes a field in emails called "carbon copy" or "cc" in which you enter the email directions you want to send a copy and that can be seen by the main recipient and a field called "blind carbon copy" or "bcc" in which you can send a copy to others but the main recipient does not know this. Therefore, if you use the BBC field you are trying to add a person to the email without the main recipient's knowledge.