Final answer:
Dell's launch of a new line of high performance, custom-made PCs is an example of a tactical action.
Step-by-step explanation:
A tactical action refers to a specific action taken by a company to achieve a short-term goal or objective. It is typically a smaller-scale action that contributes to the overall strategy of the company. Out of the provided options, the example of a tactical action is: (d) Dell's launch of a new line of high performance, custom-made PCs.