To answer this question, we need to understand the different types of requirements and when they need to be defined as custom types.
Option A) Business - This option is incorrect because business requirements are typically defined as high-level statements that describe the goals, objectives, and needs of the organization. They do not usually require a custom type.
Option B) Functional - This option is incorrect because functional requirements define the specific behaviors, features, and functions that a system must have. They can usually be defined using standard types or categories without the need for custom types.
Option C) Security - This option is correct because security requirements may need to be defined as a custom type. Security requirements are specific to the protection of the system and its data from unauthorized access, attacks, or vulnerabilities. They often require custom types to capture the unique security needs of the system.
Option D) Testing - This option is incorrect because testing requirements typically define the criteria and procedures for testing the system. They can usually be defined using standard types or categories without the need for custom types.
The correct answer is C) Security. This option needs to be defined as a custom type because security requirements often require specific and tailored definitions to ensure the protection of the system.