Final answer:
Hosts on VLAN 11 and VLAN 111 across SwitchA and SwitchB, respectively, with native VLANs set to 11 and 111, cannot communicate with each other since the switches won't pass native VLAN traffic between different native VLANs without additional configuration.
Step-by-step explanation:
The subject of this question is network configuration on switches
When two switches have different native VLANs configured on their trunk ports, they will not pass the native VLAN traffic between each other without additional configuration. Therefore, hosts within VLAN 11 will not be able to communicate with hosts within VLAN 111 and vice versa by default. In the case of SwitchA and SwitchB, where SwitchA has VLAN 11 set as native and SwitchB has VLAN 111 set as native, each switch will expect untagged traffic to belong to their respective native VLANs only.
Given the information provided and assuming no additional inter-VLAN routing or encapsulation mechanisms are in place, the correct answer would be:
a) None of the hosts can ping each other.