Which of the following descriptions about scalability design in the five principles of enterprise application architecture design is wrong?

Question

Options

• AWith few changes or even just the addition of hardware devices, the linear growth of the
• BWhen the business of the enterprise grows, the system often needs to expand and grow, and the
• CScalability generally refers to the degree to which a product is in a working or usable state when it
• DThe higher the scalability, the more convenient or more resources can be used to respond to

• A
  4% (1)
• B
  14% (4)
• C
  75% (21)
• D
  7% (2)

Explanation

Option C is wrong because it conflates scalability with availability. The phrase "degree to which a product is in a working or usable state" is the definition of availability - the ability of a system to remain operational - not scalability, which concerns a system's capacity to handle growing workload by adding resources. Options A, B, and D are all correct descriptions: A accurately captures the idea of linear capacity growth through hardware additions, B correctly identifies that business growth drives the need for system expansion, and D rightly states that higher scalability means more options and resources can be leveraged to meet increased demand.

Memory tip: Scalability = "can it grow to handle more load?" Availability = "is it up and running?" If a definition talks about a system being "in a working or usable state," that is availability language - flag it as wrong when the question asks about scalability.

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