POP is a protocol used by e-mail clients to download e-mails to your computer. The correct option among all the options that are given in the question is the last option or option "d". The full form of POP is Post Office Protocol. After the email has been downloaded, the email gets erased from the server automatically.
The answer is a smart watch most likely the apple or Samsung versions both now offer voice calls and health tracking sensors on the bottom side of the watch most popular is the apple as the company grows more everyday
