Vanessa Is Firewall Administrator in Her Company

Vanessa is firewall administrator in her company. Her company is using Check Point firewall on a central and several remote locations which are managed centrally by R77.30 Security Management Server. On central location is installed R77.30 Gateway on Open server. Remote locations are using Check Point UTM-1570 series appliances with R75.30 and some of them are using a UTM-1-Edge-X or Edge-W with latest available firmware. She is in process of migrating to R80. What can cause Vanessa unnecessary problems, if she didn't check all requirements for migration to R80?

A) Missing an installed R77.20 Add-on on Security Management Server
B) Unsupported firmware on UTM-1 Edge-W appliance
C) Unsupported version on UTM-1 570 series appliance
D) Unsupported appliances on remote locations