The closest point of approach (CPA) of a contact on a relative motion radar may be determined（）.<br>A:immediately when the contact is noted on radar<br>B:only if the radar scope is watched constantly<br>C:after the contact has been marked at least twice<br>D:by an occasional glance at the radar

The closest point of approach (CPA) of a contact on a relative motion radar may be determined（）.
A:immediately when the contact is noted on radar
B:only if the radar scope is watched constantly
C:after the contact has been marked at least twice
D:by an occasional glance at the radar

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