What setting allows a System Administrator to receive copies of emails sent by users?

The setting that allows a System Administrator to receive copies of emails sent by users is correctly identified as BCC all emails to. When the BCC (Blind Carbon Copy) option is utilized, the System Administrator receives a copy of the emails without the main recipient being aware that the Administrator is included in the communication. This is particularly useful for maintaining oversight on communications while respecting user privacy, as recipients do not see that anyone else received the email.

The other choices do not afford the same level of confidentiality. For instance, if emails were forwarded or sent as CC (Carbon Copy), all recipients would be aware of the additional parties included in the communication. Using the send copies to option does not specify the mechanism of inclusion in a way that provides anonymity for the other recipients. Therefore, BCC all emails to is the most appropriate choice for ensuring the System Administrator is informed without notifying other recipients.