Jorge is reviewing the firewall logs and sees $28$ echo requests leaving the network and ICMP echo replies cor course of a five$-$minute period. Which of the following is most likely the cause of this traffic?

Someone has run multiple ping tests from the network to an outside address.

This is standard voice$-$over$-$IP traffic and is no cause for concern.

Users are streaming multimedia from a popular video$-$sharing website.

These are authentication requests for single sign$-$on using federation with large websites.