Using AWS Identity and Access Management (IAM) to grant access only to the resources needed to perform a task is a concept known as:
restricted access.
as-needed access.
least privilege access.
token access.
Explanations:
Restricted access is not an AWS-specific term for the concept.
As-needed access is not the commonly used term for this concept in IAM.
Least privilege access refers to granting only the permissions necessary to perform tasks.
Token access relates to temporary access tokens, not resource access restrictions.
I compute that the answer is:
least privilege access.