单选题Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.AAlert the watch officer that a vessel is approaching the preset CPA limitBWarn of small targets that are initially detected closer than the outer guard zoneCGuard against target loss during critical maneuvering situationsDSound an alarm for targets first detected within the zone
单选题
Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.
A
Alert the watch officer that a vessel is approaching the preset CPA limit
B
Warn of small targets that are initially detected closer than the outer guard zone
C
Guard against target loss during critical maneuvering situations
D
Sound an alarm for targets first detected within the zone
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