This decision requires evaluating the key architectural differences between Platform Events (PE) and Outbound Messages (OM).
(A) This option correctly positions both solutions. They are asynchronous, near-real-time mechanisms that can be configured declaratively. This distinguishes them from synchronous, real-time callouts, making it a fundamental consideration for choosing the right integration pattern.
(D) This option highlights critical and factual governance limits. The customer's requirement for 3,000 consumers directly conflicts with the 2,000 concurrent CometD subscriber limit for Platform Events, making this a crucial evaluation point. The 100-notification batch limit for Outbound Messages is also a key technical constraint to consider.
(E) While imperfectly worded, this option points to a valid difference in scalability and limit models. Platform Events have granular, distinct hourly limits for publishing and delivery that require active design consideration. Outbound Messages have a simpler, high-level daily limit. The scalability and the nature of the limits are important comparative factors.
