Minimum obstacle clearance altitude refers to:

A、
A、Thelowestpublishedheightbetweenradiolocationpointsbetweencertainroutes thatmeetbarrierrequirements,andwithinthecoverageofnavigationsignalsguaranteedacceptablebymanycountries
B、Isthepublishedheightofemergencyuse,ontheapproachgraph,usingNDBor VORdevices.Inthedefinedsector,vithin25:NMdistancefromthedevice,thisheightis1,000feetabovethehigrestohstacle
C、Thelowestpublishedaltitudewith.nVO.,routes,off-routetracks,orthroughoutanentiresegment,onsegmentsmeeti:gobstacleclearancerequirements,betweentheirradiofixes,andwithinthecoverageofnavigationsignalsguaranteed acceptableintheUSA,isthelowestpublis!edaltitudewithin22nauticalmilesofaVORstation.
D、
D、