What are the three tiers of Lifecycle Management?

According to the Hardware Asset Management page, the three tiers of Lifecycle Management are:

Know what you have: This tier involves tracking and managing the end-to-end lifecycle of all your hardware assets, physical and consumable, on a single system of action.

Improve management controls: This tier involves aligning hardware investments to business outcomes, and quickly identifying and mitigating technology risks such as tech debt, regulatory audits, and lost assets.

Improve efficiency: This tier involves improving efficiencies and simplifying every stage of the asset lifecycle with prescriptive workflows and tasks, normalizing hardware to maintain a clean CMDB, and getting actionable insights to minimize waste and strategize for asset refreshes.

These three tiers correspond to the options C, D, and E in the question.

The options A and B are not part of the Lifecycle Management framework, and are not mentioned in the ServiceNow Hardware Asset Management documents. References:

Hardware Asset Management

What is Hardware Asset Management?

Your asset lifecycle: How to manage it all