Exclusive accounts, also known as privileged accounts, primarily ensure that only authorized personnel have access to critical systems and data. Their main purpose is to provide enhanced security measures by limiting user access to sensitive information. Non-repudiation (individual accountability) is a security principle that ensures that a person cannot deny the authenticity of their signature on a document or a message they sent. While exclusive accounts can aid in maintaining accountability through monitoring and logging, their primary purpose is not to ensure non-repudiation.