What is the primary purpose of the notice to teachers regarding ACT exams?

The primary purpose of the notice to teachers regarding ACT exams is to recruit volunteers for the test. This is significant because teachers often play a crucial role in facilitating standardized tests like the ACT. By reaching out to educators, the notice ensures that there are enough personnel available to administer the exam effectively. Involving teachers not only helps in managing logistics but also utilizes their familiarity with students, which can enhance the testing environment.

The other options, while they might seem relevant in a broader context, do not encapsulate the main focus of such notices. For instance, informing about an upcoming event or announcing changes in testing dates, though important, does not directly relate to the active involvement of teachers. Similarly, while payment changes can affect teachers as well, it is not the central aim of these communications regarding the ACT test. Therefore, the emphasis on volunteer recruitment stands out as the primary objective of the notice.