Fences four feet high can be used to: A. Deter casual trespassers
B. Provide reasonable defense from external intrusion
C. Discourage a determined intruder
D. Slow down a determined intruder

A. Deter casual trespassers

Explanation:

In safeguarding valued property, fences are used to serve as a psychological and physical barrier to intending intruders. Depending on its height, the fence could serve several purposes. A fence that is three to four foot high would only serve to deter casual trespassers. This is because any intruder would make an effort to scale a four-foot-high fence.

However, when an intruder is determined he would make an effort to scale a fence that is even up to eight-foot-high. So to provide optimum security, a very high fence supported with barb wire and a closed-circuit television camera would help to ensure that the environment is monitored against any determined intruder.

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