正解:A
Comprehensive and Detailed In-Depth Explanation:
Infrastructure as a Service (IaaS) provides virtualized computing resources over the internet such as servers, storage, and networking. It allows a business to quickly spin up virtual machines and is ideal for disaster recovery and scalable IT infrastructure needs.
* Option B: SecaaS focuses on cloud-delivered security, not infrastructure.
* Option C: PaaS offers development environments, not full virtual infrastructure.
* Option D: SaaS delivers applications over the internet (e.g., email, CRM) - not for disaster recovery.
CompTIA A+ Core 1 Exam Objective Reference:
* Objective 4.1: Compare and contrast cloud computing concepts.