In the accompanying figure of a typical network configuration, Item 2 indicates a ____.

Formulas and ________ can be inserted in tables to provide totals and perform other calculations

Fill in the blank(s) with correct word

An administrator is setting up a new mail server on the network and wants to open necessary ports to allow POP3 protocol for mail delivery. Which of the following ports should be opened in the internal and external firewalls?

A. 101 B. 110 C. 123 D. 161