Which statement is true regarding Cisco Cloud-Delivered Firewall?
O Cisco Cloud-Delivered Firewall is supported by constructing a GRE tunnel between the on-premise network device and the Cisco Umbrella cloud.
O Cisco Cloud-Delivered Firewall is supported by constructing an IPsec tunnel between the on-premise network device and the Cisco Umbrella cloud.
O Cisco Cloud-Delivered Firewall only supports layer 3/4 inspections.
O Cisco Cloud-Delivered Firewall requires the Umbrella Roaming Clients.