Regarding Identity and Access Management (IAM), Which type of special account belonging to
your application allows your code to access Google services programmatically?

A.
Service account

B.
Simple Key

C.
OAuth

D.
Code account

Explanation:
A service account is a special Google account that can be used by applications to access Google
services programmatically. This account belongs to your application or a virtual machine (VM),
instead of to an individual end user. Your application uses the service account to call the Google
API of a service, so that the users aren’t directly involved.
A service account can have zero or more pairs of service account keys, which are used to
authenticate to Google. A service account key is a public/private keypair generated by Google.
Google retains the public key, while the user is given the private key.
https://cloud.google.com/iam/docs/service-accounts