Final answer:
Handwashing stations should allow employees to wash their hands when necessary, conveniently and thoroughly, for at least 20 seconds to prevent the spread of pathogens.
Step-by-step explanation:
The question relates to the features handwashing stations should offer to employees. The correct answer is: a. conveniently wash their hands when necessary. According to the CDC recommendations, handwashing should be performed often, especially after certain activities such as using the toilet or before eating, to prevent the spread of pathogens. A proper handwashing station should provide a convenient space where employees can thoroughly wash their hands with soap and water for at least 20 seconds, ensuring all areas of the hands are covered, and then dry them completely using a clean towel or an air dryer.