The scenario presents two distinct business events. The first is the automatic, monthly printing of payslips, which is a time-based event triggered by the calendar (end of the month). The second event is the decision by senior management to award a bonus. Since this decision originates from within the organization and triggers a business process (re-calculating and re-printing payslips), it is classified as an internal event. Therefore, both internal and time-based events are identifiable.

B. External and Internal: The scenario does not describe any event triggered by an entity outside the organization, such as a customer or a regulatory body.

C. External and Time based: The management's decision to issue a bonus is an internal event, not an external one.

D. Time based only: This is incomplete as it overlooks the management decision, which is a significant internal event that directly impacts the payroll process.

1. Paul, D., Cadle, J., & Yeates, D. (2020). Business Analysis (4th ed.). BCS, The Chartered Institute for IT.

Page 91, Section 5.4.3, "Business events": This section defines the three types of business events. It explicitly states, "Time-based events... happen at a given time, for example, end of the month..." which directly corresponds to the monthly payslip printing. It also defines, "Internal events... are triggered from within the organization. For example, the management may decide to launch a new product..." which aligns perfectly with the senior management's bonus decision. This confirms the presence of both event types in the scenario.