Answer should be C as it's impacting the services. Option A is more of that application is not designed according to requirements and that's why needed more service.

C. operational errors impacting service delivery.

Wt concern on the approved? I on C,Operation affect delivery

A. shows the project did not meet its purpose in the first place hence the modifications

During a post-implementation review of a new software application, the IS auditor's primary concern should be the stability and reliability of the software in its operational environment. An increasing number of operational errors impacting service delivery indicates potential issues with the software's performance, quality, or usability, which could lead to significant business disruptions or failures. A. change requests approved to add new services: While an increasing number of change requests may indicate a growing demand for additional functionality, it is not necessarily a negative sign. It could reflect that users are finding new ways to leverage the application. However, it is less critical than operational errors that directly impact service delivery.

Impacting on Business is more of a focus than any other option. C

B looks like some sort of things wasnt completed perfectly during the design phase of this app.

New change requests approved are additional features to be developed/ implemented. If there is an increase in the operational issues, the organisation may not be fulfillilling / achieving the desired objective/ business requiremesnt. The most imp goal of post impl review is to ensure that business requiremnets are met. so as per me the ans could be ' A'