Answer: vertical scaling

The question asks for the term that describes increasing a virtual machine's computing capacity by adding memory or CPUs. Vertical scaling (option B) is the correct answer because it specifically refers to enhancing the resources (e.g., CPU, memory) of an existing single machine, which aligns with the scenario described. Horizontal scaling (option C) involves adding more machines to a system, not upgrading an individual one. Agility (option A) is a broader concept related to quick adaptation to changes, not resource scaling. Elasticity (option D) refers to automatic scaling based on demand, which can include both vertical and horizontal methods but is not the specific term for manually adding resources to a single VM. The community discussion strongly supports B, with high upvotes for comments explaining that vertical scaling means adding resources to a single machine, while horizontal scaling means adding more machines.

Author: LeetQuiz Editorial Team