Solution

Correct Answer: (iii) Volatile requirement

Explanation

Requirements are classified by how stable they are:

• Enduring requirements - stable, tied to the core activity of the organization; they change rarely.
• Volatile requirements - likely to change during development or after delivery because of evolving business conditions, policies, laws or technology.

A requirement expected to change because of evolving business conditions is therefore volatile.

Why other options are incorrect:

• (i) Enduring - the opposite: stable and long-lasting.
• (ii) Structural - not a standard stability category.
• (iv) Derived - a requirement obtained from other requirements, not defined by how often it changes.

Answer: (iii) Volatile requirement