Which statement from paragraph $4$ is an example of evidentiary support?

Cell phones also allow students access to important public announcements and alerts.

Having access to cell phones in schools can be the key to keeping students safe.

The Federal Communications Commission $($FCC$)$ and the Federal Emergency Management Agency $($FEMA$)$ have developed Wireless Emergency Alerts.

These are text messages that will warn the public about severe weather events, possible floods, or other local and national emergencies.