Whole Fruits Market took the following actions to improve internal controls. For each of the following actions, identify the internal control principle the company followed.

a$.$ Personal ID cards are used to limit access to only authorized employees.

b$.$ The company divides responsibility for a transaction between multiple departments.

c$.$ Each cashier is designated a specific cash drawer and is solely responsible for cash in that drawer.

d$.$ Preprinted forms are used to reduce the chance of missing transaction details.

e$.$ The company's internal auditors frequently assess the performance of internal controls.

f$.$ Prohibit the recordkeeper from having control over cash.