According to the BABOK® Guide, a textual requirement is a requirement that is expressed in natural language, such as English, French, or Arabic. A textual requirement should describe the capabilities of the solution, any conditions that must exist for the requirement to operate, and any constraints that may prevent the solution from fulfilling the requirement. A constraint is a restriction or limitation that affects the solution, such as a technical, legal, regulatory, or business rule. Therefore, option A is the correct answer. The other options are not components of the textual requirement, but rather guidelines or techniques for writing effective textual requirements. References: BABOK® Guide, page 115; Business Analysis Expert Certification, CCBA® | IIBA®, section “What Should I know to be CCBA Certified?”