The last option:
Avoid forwarding e-mail messages unless you have permission to do so.
The only one of those I would trust is the site ending with EDU I hope this helps you.
Answer:
C. Confidentiality
Explanation:
With confidentiality, a person who intercepts messages you intend to remain private cannot read them and thus increases your document protection
Typically, "Del" stands for "delete."
Most times, this key will do different things depending on the type of keyboard/computer you have. For example, on macs, the "delete" key is also the backspace key, so it will delete the last character you typed. However, on most pcs, the "delete" key will delete characters you typed that are in front of your cursor.