What represents an Enterprise System monitoring methodology?

A.
monitoring web servers, application servers, database servers, and middleware

B.
configuring remote servers; creating monitors; defining alerts; reviewing reports

C.
installing SiteScope; creating groups; deploying monitors; viewing reports

D.
identifying what to monitor; creating groups and monitors; defining thresholds; setting the
sampling frequency; configuring alert triggers and actions

E.
setting up monitors for files, services, processes, and resources