EXECUTE is to carry out an internal control procedure, such as to sign and mail a check after inspecting supporting documents.
MARGINAL is just barely adequate or within a lower limit.
CORE BUSINESS is the sector(s) of business activity that is the reason or purpose for being, e.g. providing communications services within a telephone company would be considered core, while real estate holdings and the securities investment portfolio will likely be considered non-core business activities.
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