A configuration item (CI) is a record that represents an IT asset or service in the Configuration Management Database (CMDB)1.
A CI tracks the operational and relationship information of the asset or service, such as its current status, location, owner, and dependencies1.
A hardware asset is a physical component of an IT system, such as a laptop, server, or router2.
A hardware asset attribute is a property or characteristic of the hardware asset, such as its model, serial number, or warranty2.
Some hardware asset attributes are also part of the CI, such as IP address, CPU, operating system, and memory1. These attributes reflect the operational state of the hardware asset and are relevant for configuration management purposes1.
However, some hardware asset attributes are not part of the CI, such as cost2. Cost is a financial information of the hardware asset that is tracked by the Asset Management application2. Cost is not relevant for configuration management purposes and is not stored in the CMDB2.
Therefore, the hardware asset attribute that should be tracked that is not part of the CI is C. Cost. Reference:
1: Configuration Item
2: Hardware Asset Management

According to the Hardware Asset Management documentation, the hardware asset management content service is a cloud-based service that provides normalized and enriched hardware model data to the ServiceNow platform, such as manufacturer name, model name, model number, and product lifecycle information.
The hardware asset management content service helps customers identify and manage their hardware assets more effectively, as well as plan for hardware refreshes based on end-of-life (EOL) and end-of-service (EOS) dates1.
The elements that are provided by the hardware asset management content service are as follows1:
Manufacturer lifecycle dates: The dates when the manufacturer stops selling, supporting, or servicing a hardware product.
Manufacturer: The name of the company that produces the hardware product.
Model name: The name of the hardware product, such as Dell Latitude E7450 or HP ProLiant DL380 Gen10.
Therefore, the correct answers are options A, D, and E, as they are the elements that are provided by the hardware asset management content service. References:
Hardware Asset Management documentation
What is Hardware Asset Management?