During the collect requirements process, an influential stakeholder requested a feature which was rejected. During the project execution, you notice that you have an opportunity to incorporate the requirement of this stakeholder into the product and it will cost you nothing. By doing so, the stakeholder will be pleased and may help you in your next assignment. This is an example of:

(a) Scope creep

(b) Scope slippage

(c) Gold plating

(d) Opportunity