Which statements about firewalld zones are most correct.

a. By default, all traffic leaving the host is allowed.
b. By default, any incoming traffic that is part of a communication started by the host is allowed.
c. The drop zone drops all traffic, similar to disconnecting the network cable from the network interface.
d. The public zone is the default zone for newly added network interfaces.
e. The trusted zone blocks incoming traffic unless it matches ssh and mdns, ipp-client, samba-client, and dhcpv6-client services.