Two features of internal control are presented in the following sections.Each is followed by a list of four irregularities that occurred in processing data.Identify the one irregularity from each list that would be discovered or prevented by the feature of internal control described. 
Definitions:
Compound Microscope
An optical instrument consisting of a series of lenses that magnify objects in steps; used for detailed observation of microorganisms and cells.
Substage Illuminator
A light source located beneath the stage of a microscope, used to illuminate the specimen from below.
Iris Diaphragm
An adjustable aperture used in optical instruments, like microscopes and cameras, to control the amount of light passing through the lens.
Condenser
A device used to condense vapor into liquid, widely used in laboratory equipment, air conditioning, and power plants.
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