What will extend a trust boundary (there is switch interface configuration with separate voice VLAN and data VLAN configured where the phone is connected to, also small diagram showing endpoint (host), IP Phone, Access Switch, Distribution Switch, Core Switch and Data Centre Aggregation switch)?

What will extend a trust boundary (there is switch interface configuration with separate voice VLAN and data VLAN configured where the phone is connected to, also small diagram showing endpoint (host), IP Phone, Access Switch, Distribution Switch, Core Switch and Data Centre Aggregation switch)?
A . Multiple layers PC
B . IP Phone
C . Access Switch
D . Distribution Switch
E . Core Switch

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Answer: D