The following description about port isolation, which is incorrect?

Port isolation provides users with more safer and more flexible networking solution.

The following description about port isolation, which is incorrect?
A . Port isolation can be used to configure Layer 2 isolation.
B . In the default mode, port isolation is Layer 2 isolation and Layer 3 interworking.
C . Port isolation must be configured on the ports that need to be configured for port isolation.
D . Port isolation command port-isolate enable specifies the port configuration in global mode.

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Answer: D