Correct Answer: A
To elect SW4 as the root bridge for VLAN 1, the priority value needs to be lower than any other switch in the network for that VLAN. The default priority value is 32768, and by setting SW4's priority to 32768 for VLAN
1, it does not guarantee that SW4 will become the root bridge unless all other switches have their priorities set higher or equal and have a higher MAC address. However, assuming all other factors are default, this could make SW4 a candidate for being the root bridge if it has the lowest MAC address.
To put G0/2 on SW2 into a blocking state, we need to influence the Spanning Tree Protocol (STP) decisions.
This can be done by manipulating port costs or priorities to ensure that this port does not provide the best path to the root bridge. By setting the spanning-tree cost of G0/2 on SW2 to 128, it increases the likelihood of this port being selected as a non-designated port if there is another path with a lower cost.