If you see the diagram of SVC, notice that "Demand" is referred to as an external input. This demand refers to customer requirements.

4.5 Each activity transforms inputs into outputs. These inputs can be demand from outside the value chain

Answer is C

correct answer is C

D also works because as requirements change, a feedback loop to provide constant feedback can be used as an external feedback to maintain value.

C is correct.

correct its C

C is the correct answer. You'll find this under key inputs for 'Engage' value chain activity. It states 'detailed requirements for services and products provided by customer'

From book: Service desk Purpose: „to capture demand for incident resolution and service requests. It should also be the entry point and single point of contact for the service provider with all of its users" Service desks provide a clear path for users to report issues, queries, and requests, and have them acknowledged, classified, owned, and actioned.

is Customer requirements can be counted as an input?

Answer is "A" The Service Value Chain has key inputs and outputs for each activity. Inputs can come from external sources, such as Governance; they also come from other activities in the Service Value Chain, such as "Improve", Engage, and Obtain/Build.