【单选题】
Refer to the exhibit. <br /> Which statement is true about where trust boundaries should be established  in a network？（）<br /> <img src="https://nimg.ppkao.com/2018-07/gelingxia/2018073014212976597.jpg?sign=684b4fe0f3f5b6deac7472147626b789&t=62d1a3bc" /><br />
A、Endpoints 2 and 3 are optimal places to establish a trust boundary. Endpoint 1 is an acceptable place to establish a trust boundary.
B、Endpoint 2 is the optimal place to establish a trust boundary. Endpoints 1 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 1 is the only acceptable place 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、Endpoint 1 is the optimal place to establish a trust boundary. Endpoints 2 and 3 are acceptable places to establish a trust boundary.
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