The host PCA, PCB and PCC are respectively connected to the Ethernet1/0/1 Ethernet1/0/2 and Ethernet1/0/3 ports of the switch SWA, and their addresses are in the same network segment. Check the VLAN on SWA as follows display:

The host PCA, PCB and PCC are respectively connected to the Ethernet1/0/1 Ethernet1/0/2 and Ethernet1/0/3 ports of the switch SWA, and their addresses are in the same network segment. Check the VLAN on SWA as follows display:

[SWA]display vlan 10

VLAN ID: 10

VLAN Type: static

Route Interface: not configured

Description: VLAN 0010

Name: VLAN 0010

Tagged Ports: none

Untagged Ports:

Ethernet1/0/1 Ethernet1/0/24

[SWA]display vlan 20

VLAN ID: 20

VLAN Type: static

Route Interface: not configured

Description: VLAN 0020

Name: VLAN 0020

Tagged Ports: none

Untagged Ports:

Ethernet1/0/2Ethernet1/0/24

[SWA]display vlan 30

VLAN ID: 30

VLAN Type: static

Route Interface: not configured

Description: VLAN 0030

Name: VLAN 0030

Tagged Ports: none

Untagged Ports:

Ethernet1/0/1 Ethernet1/0/2 Ethernet1/0/24

It can be judged from the above output information
A . PCA can communicate with PCB
B . PCA can communicate with PCC
C . PCB can communicate with PCC
D . PCA, PCB and PCC cannot communicate with each other