Final answer:
A client can request a new ETA, seek an alternative service provider, negotiate with the current SP, or cancel the service if the provided ETA by the Service Provider is not acceptable.
Step-by-step explanation:
When a Service Provider (SP) provides an Estimated Time of Arrival (ETA) that is not acceptable, a client has several options. Firstly, the client can request for a new ETA that would be more agreeable to their schedule. If this is not possible, the client may seek to find a different service provider who can meet their timing requirements. Additionally, the client might negotiate with the SP to find a middle ground, such as compensation for the delayed service. In some cases, a client might have to cancel the service entirely if timing is a critical factor and no acceptable solution can be reached.