Which of the following questions would an auditor most likely include on an internal control questionnaire for notes payable?

a. Are assets that collateralize notes payable critically needed for the entity's continued existence?

b. Are two or more authorized signatures required on checks that repay notes payable?

c. Are the proceeds from notes payable used for the purchase of noncurrent assets?

d. Are direct borrowings on notes payable authorized by the board of directors?