During a routine audit, you discover that an employee has been connecting their workstation to the internet via a public Wi-Fi network at a local coffee shop to complete work tasks when off-site. Which of the following presents the greatest security risk in this scenario?
The age and speed of the Wi-Fi access point in the coffee shop.
Outdated anti-virus software on the employee's workstation.
The lack of secure network communication channels on the public network.
Unauthorized software installations on other workstations within the company's secure network.