Consumables are hardware assets that are not tracked individually, but as a quantity of items in a stockroom, such as keyboards, mice, cables, etc.1 When a stock manager receives a new delivery of consumables, they can use the Mobile Asset Receiving feature to scan the barcode of the purchase order and receive multiple assets against it using a mobile device2 If the received consumables match another record in the stockroom based on the following fields: Assigned to, Model, Model category, State, Stockroom, and Substate, then the data is automatically merged to create a blended quantity and cost3 This means that the system calculates the average cost per item and the total quantity of the consumables in the stockroom, and updates the existing record accordingly3 This feature helps to reduce duplicate records and simplify inventory management of consumables3

Transform maps are used to transform imported hardware model data from an import set table to a target table, such as the Product Catalog or the Asset table1 Coalesce is an option that you can set on a field mapping to uniquely identify the same asset in order to merge or update records2 Coalesce means that the field is used as a unique key. If a match is found using the coalesce field, the existing record is updated with the imported information. If no match is found, a new record is inserted2 Coalesce helps to prevent duplicate records and ensure data consistency2 You can set coalesce on one or more fields in a transform map, but at least one coalesce field is required2 The other options, B. Consolidate, C. Unique identifier, D. Unique source, E. Unique target, and F. Combine, are not valid options for setting the unique identification of assets in transform maps

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