The most important part of a feasibility study is the economics1. A cost-benefit analysis of available products is crucial as it helps to understand the economic viability of the project1. It compares the costs of the project with the benefits it is expected to deliver, which is essential for making informed decisions1. Omitting this could lead to investments in hardware that may not provide the expected returns or meet the organization's needs.
References:
The Components of a Feasibility Study - ProjectEngineer

Penetration testing is a method of evaluating the security of a system or network by simulating an attack from a malicious source. Penetration testing typically consists of four phases: planning, discovery, attacks, and reporting. In the discovery phase, penetration testers gather information about the target system or network, such as host detection, domain name system (DNS) interrogation, port scanning, service identification, operating system fingerprinting, vulnerability scanning, etc. This information can help to identify potential entry points, weaknesses, or vulnerabilities that can be exploited in the subsequent attack phase. Host detection and DNS interrogation are techniques that can be used in the discovery phase to determine the active hosts and their IP addresses and hostnames on the target network. References: [ISACA CISA Review Manual 27th Edition], page 368.

Given the large volume of data transactions, continuous monitoring is the best testing strategy for auditing the inventory control process. Continuous monitoring involves the automated review of operational and financial data to identify anomalies or areas of concern12. This approach allows for real-time identification and resolution of issues, making it particularly effective for large organizations with high transaction volumes12.
References: ISACA's Information Systems Auditor Study Materials1

Data integrity is the property that ensures that data is accurate, complete, consistent, and reliable throughout its lifecycle. The best data integrity check is tracing data back to the point of origin, which is the source where the data was originally created or captured. This check can verify that data has not been altered or corrupted during transmission, processing, or storage. It can also identify any errors or discrepancies in data entry or conversion. Counting the transactions processed per day is a performance measure that does not directly assess data integrity. Performing a sequence check is a validity check that ensures that data follows a predefined order or pattern. It can detect missing or out-of-order data elements, but it cannot verify their accuracy or completeness. Preparing and running test data is a testing technique that simulates real data to evaluate how a system handles different scenarios. It can help identify errors or bugs in the system logic or functionality, but it cannot ensure data integrity in production environments. References: Information Systems Operations and Business Resilience, CISA Review Manual (Digital Version)