单项选择题
Software（）focusesonthreeattributesoftheprogram：softwarearchitecture，datastructure，andproceduraldetail.
A.analysis
B.design
C.installation
D.upgrade
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The（）schemeinadatabasesystemisresponsibleforthedetectionoffailuresandfortherestorationofthedatabasetoastatethatexistedbeforetheoccurrenceofthefailure.
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