What is the focus of SAQ-C for merchants?

The focus of SAQ-C for merchants centers on implementing dedicated payment application systems. This Self-Assessment Questionnaire (SAQ) is specifically designed for merchants that handle cardholder information through standalone, point-of-sale (POS) devices or systems. These dedicated applications are separate from a website or other systems that might integrate with a payment processor.

By emphasizing the need for dedicated payment application systems, SAQ-C aims to ensure that merchants maintain a secure environment for processing card transactions. This entails adhering to the necessary security measures outlined in the Payment Card Industry Data Security Standard (PCI DSS) to protect sensitive cardholder data, reducing the risk of breaches or fraud.

The other options involve various payment methods or systems that do not specifically align with the scope and focus of SAQ-C. For instance, accepting card payments via mobile apps or ensuring secure internet payment systems may be applicable in different SAQs. Similarly, accepting payments exclusively by mail does not relate to the features of dedicated application systems outlined in the SAQ-C framework. Hence, focusing on dedicated payment application systems is essential for understanding the specific requirements for merchants under this particular SAQ.