Perfective maintenance usually is cost effective ____ the system's operational life.
A) early in
B) during the middle of
C) late in
D) all of the above

Name: Perfective maintenance usually is cost effective ____ the system's operational life. A) early in B) during the middle of C) late in D) all of the above
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The Answer of Perfective maintenance usually is cost effective ____ the system's operational life.
A) early in
B) during the middle of
C) late in
D) all of the above

Perfective Maintenance Usually Is Cost Effective ____ the System's Operational