In ITIL 4, service request management is one of the 7 practices described in more detail.

A service request is defined as a user request for something to be provided – for example:

access to an application or file

information or advice

a standard change that is preapproved

a new or replacement item of equipment

The key idea is:

A service request is a formal request from a user for something they are entitled to receive as part of a service.

Looking at each option:

This describes an incident.

An incident is an unplanned interruption to a service or reduction in its quality.

A request to restore normal service operation after something has gone wrong is handled by the incident management practice, not by service request management.

So this is not a service request.

This normally relates to a change.

Implementing a patch modifies the live environment.

This is usually handled through the change enablement practice (and then deployment management), often as a normal change or standard change, depending on the organization’s policies.

Although some standard changes can be triggered via service requests, ITIL Foundation typically uses clearer examples (such as access requests). This option is not the best example.

This is a classic example of a service request:

A user is asking for access (permission) to something as part of an existing service.

It is not fixing something broken, it is asking for something to be provided.

ITIL 4 explicitly lists access requests (for example, to applications, services, or data) as a common type of service request within the service request management practice.

Therefore, C is the correct answer.

This describes problem management:

When we investigate the root cause of one or more incidents, we are using the problem management practice.

The aim is to understand and remove the underlying cause, not to provide a standard service action requested by a user.

So this is not a service request.

This aligns with ITIL 4 Foundation descriptions of:

Service request – a user request for something to be provided.

Service request management practice – managing all types of service requests in a user-friendly and efficient way.

Incident management – restoring normal service operation as quickly as possible.

Problem management – identifying and managing the causes of incidents.

Change enablement – ensuring that changes are evaluated, authorized, and managed.

That is why “a request for access to a file” is the correct example of a service request.