A written test:

A written test is designed to evaluate a learner's understanding and retention of information, which aligns directly with assessing the accomplishment of cognitive learning objectives. This form of assessment measures a student's comprehension, analytical capabilities, and ability to recall relevant knowledge pertaining to the course material.

In a well-structured educational framework, written tests serve as vital tools to ensure that learners have absorbed theoretical concepts that support practical applications they may engage with in the field. It is essential for assessing not just rote memorization, but also the ability to apply learned concepts to various scenarios, thereby reinforcing the overall educational objectives.

The other choices present an incomplete picture of what a written test encompasses. For instance, focusing only on practical skills undermines the theoretical foundations necessary for those skills. Concentrating on student attendance disregards the quality of learning and engagement. Labeling the written test as optional would compromise its role as a standard measure of understanding, potentially allowing gaps in knowledge to go unaddressed. This comprehensive evaluation of cognitive learning is why the selection of this answer is appropriate.