Refer to the exhibit. Which statement is true about where trust boundaries should be established in a  network？（）

• A、 Endpoint 1 is the only acceptable place to establish a trust boundary.
• B、 Endpoint 1 is the optimal place to establish a trust boundary. Endpoints 2 and 3 are acceptable places to establish a trust boundary.
• C、 Endpoint 2 is the only acceptable place to establish a trust boundary.
• D、 Endpoint 2 is the optimal place to establish a trust boundary. Endpoints 1 and 3 are acceptable places to establish a trust boundary.
• E、 Endpoints 1 and 2 are optimal places to establish a trust boundary. Endpoint 3 is an acceptable place to establish a trust boundary.
• F、 Endpoints 2 and 3 are optimal places to establish a trust boundary. Endpoint 1 is an acceptable place to  establish a trust boundary.