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.