olemus
(a) turvaklassi alamhulk, sõltub kasutatavast mudelist
= a subset of the security class, depends on the model used

(b) turvalisus mingi liigitussüsteemi alamklassina
= security as a subclass of some classification system
https://www23.statcan.gc.ca/imdb/p3VD.pl?Function=getVD&TVD=1278187&CVD=1278411&CPV=RDF2030110&CST=01012020&CLV=4&MLV=4