An audit report contains the following observations:

a. A service departments location is not well suited to allow adequate service to other units.

b. Employees hired for sensitive positions are not subjected to background checks.

c. Managers do not have access to reports that profile overall performance in relation to other benchmarked organizations.

d. Management has not taken corrective action to resolve past engagement observations related to inventory controls.

Which two of these observations are most likely to indicate the existence of control weaknesses over safeguarding of assets? Why?