根据《1979年国际海上搜寻救助公约》，"Search and rescue region" is()
（A）An area of defined dimensionswithin which search and rescue services are provided.
（B）A unit subordinate to a rescueco-ordination centre established to complement the latter within aspecified area within a search and rescue region.
（C）A land unit, stationary or mobile,designated to maintain a watch on the safety of vessels in coastal areas.
（D）A unit responsible for promotingefficient organization of search and rescue services and for co-ordinating the conduct of search and rescue operations within a search and rescue region.
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