Refer to the exhibit. Which STP enhancement should be configured in the network to effectively enforce the position of the root bridge?

- BPDU guard should be configured on edge ports on the access switches.
- Loop guard should be configured on the link between distribution switches DSW1 and DSW2.
- Root guard should be configured on the distribution switch ports that face the access switches.
- PortFast should be configured on the uplink ports from the access switches to the distribution switches.
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