Classify the following control activities as general or application and explain your reasoning,

(a) Employees have a password to gain access to the system.

(b) When sales are entered the system retrieves customer details based on the customer number.

(c) A check is performed to identify if all cheques can be accounted for.

(d) Systems development is subject to signoff by the CIO before it can take place.

(e) Virus definitions are updated daily.