Answer:
C. Layla, a software engineer employed by Eureka Computer Solutions.
Step-by-step explanation:
An internal customer refers to any individual who has any connections to the said company either through employment or a partnership or any kind of relationship in helping the company get its products to the external customers. This means that the internal customer is someone who works or is a part of the company in any form.
Thus, an internal customer of Eureka Computer Solutions will be Layla, the software engineer who works in the company.