Cloud computing models – UGC NET Question

Statements A, B and D correctly define IaaS, SaaS and PaaS, whereas statement C contradicts the very idea of cloud computing. In cloud models, many applications and resources are hosted remotely and accessed over networks, so local installation is not always required. IaaS offers virtual hardware, SaaS provides ready-to-use applications and PaaS supplies a development platform. Hence, the combination that includes A, B and D but excludes C is the correct answer.

Option A:
Option A is incorrect because it includes only A and B and omits D. While A and B are true, statement D is also correct in describing PaaS as a cloud-based development environment. Excluding a true statement means this option does not fully represent cloud computing models.

Option B:
Option B is correct because it selects A, B and D, the three accurate statements. It captures the distinctions between infrastructure, platform and software services in the cloud. By excluding the false claim in C, it reflects the essential features of cloud computing.

Option C:
Option C is incorrect because it lists only B and D as correct and omits A. Statement A is also valid, explaining virtualised infrastructure in IaaS. Any answer that leaves out one of the true statements fails to answer the question completely.

Option D:
Option D is incorrect because it assumes all four statements are correct. Accepting statement C would imply that cloud computing always depends on local installation, which is the opposite of its typical usage. Including this false statement invalidates the combination.