Explanation
User quotas are what will help control the amount of space that is being used by a file server in the cloud that has a limited amount of disk space due to financial considerations. User quotas are the limits or restrictions that are imposed on the amount of space that each user can use or consume on a file server or storage device.
User quotas can help to control the amount of space that is being used by:
Preventing or reducing wastage or overuse of space by users who may store unnecessary or redundant files or data on the file server or storage device.
Ensuring fair and equal distribution or allocation of space among users who may have different needs or demands for space on the file server or storage device.
Monitoring and managing the usage or consumption of space by users who may need to be notified or alerted when they reach or exceed their quota on the file server or storage device.

Removing the published plain-text password and changing the affected IAM user's password are the first actions that a cloud administrator should take after accidentally uploading a password for an IAM user in plain text, as they can prevent or limit any unauthorized or malicious access to the cloud resources or services using the compromised password. Removing the published plain-text password can ensure that the password is not exposed or available to anyone who may access or view the uploaded file. Changing the affected IAM user's password can ensure that the password is updated and secured using encryption or hashing techniques. Reference: CompTIA Cloud+ Certification Exam Objectives, page 14, section 2.7

Explanation
Vulnerability testing is a type of security testing that identifies and evaluates the weaknesses or flaws in a system or service that could be exploited by attackers. Vulnerability testing can help meet security compliance requirements when deploying a new cloud solution, as it can reveal any potential security risks or gaps in the cloud environment and provide recommendations for remediation or mitigation. Vulnerability testing can also help improve security posture and performance, as it can prevent or reduce the impact of cyberattacks, data breaches, or service disruptions. References: CompTIA Cloud+ Certification Exam Objectives, page 14, section 2.7

Explanation
One possible explanation for why two application servers have not generated any logs for a period of three days, while others continue to send logs normally, is that the application servers were migrated to the cloud as laaS (Infrastructure as a Service) instances. laaS is a cloud service model that provides virtualized computing resources over the internet, such as servers, storage, network, and operating systems. When an application server is migrated to the cloud as an laaS instance, it may require some configuration changes to enable the syslog forwarding to the same destination as before. For example, the laaS instance may have a different IP address, hostname, firewall rules, or network settings than the original server. If these changes are not properly made, the laaS instance may not be able to communicate with the syslog solution and send logs as expected.

PaaS is the most suitable service model would be used for a database in the cloud.
IaaS is of course can be used to bring up instances and then install database application on top of those instances. However, this approach does not utilize full advantages and benefits of cloud computing. The administrators have to manage and maintain all necessary infrastructure that can be offload by PaaS solution.
Example: Azure SQL Database is a fully managed platform as a service (PaaS) database engine that handles most of the database management functions such as upgrading, patching, backups, and monitoring without user involvement. SQL Server on Azure Virtual Machines (VMs) is an IaaS offer and allows you to run SQL Server inside a virtual machine in the cloud.