Which three statements regarding GRE tunneling are true? $($Choose three.$)$

GRE supports multicast; therefore, IGP protocols such as EIGRP and OSPF are supported.

GRE supports only unicast and hence IGP protocols such as EIGRP and OSPF are not supported; only static routing is supported.

GRE adds an extra $20-$byte GRE header and a $4-$byte new IP header to the packet.

GRE adds an extra $4-$byte GRE header and a $20-$byte new IP header to the packet.

To avoid recursive loops, you add a route to the tunnel destination address using the tunnel interface itself.

To avoid recursive loops, you need to avoid any configuration mistakes while adding routes to the tunnel destination address using the tunnel interface itself.