CompTIA Cloud+ Practice Test 2025 - Free CompTIA Cloud+ Practice Questions and Study Guide

The correct method for setting permissions for access to a public cloud object storage bucket from a Linux VM is through access control list (ACL) authorization. ACLs provide a way to fine-tune permissions for individual users or groups, allowing for detailed control over who can access specific resources within the storage bucket.

Using ACLs, Christina can define not only who has access to the bucket but also the type of access they have, such as read or write permissions. This granularity helps in managing security and ensuring that sensitive data is not compromised by providing excessive access to users.

In contrast, the other options, while relevant to access control in various contexts, do not apply directly or effectively to the management of permissions for cloud object storage. Federations generally relate to establishing trust relationships between identity providers, which is not specifically about setting permissions on storage. Permission-based methods could refer to broader concepts but lack the level of specificity that ACLs provide in this scenario. Single Sign-On (SSO) simplifies authentication across services but does not directly control permissions at the bucket level in object storage. Therefore, ACL authorization stands out as the most appropriate and effective method in this context.