Which of the following would be appropriate when considering inbound access security for a web- based SaaS solution?

Antivirus/anti-malware solutions are designed to detect, prevent, and remove malicious software from systems and files, which is important for endpoint and server security but does not directly manage inbound network access control for a web service.

IPSec (Internet Protocol Security) is a suite of protocols that provides authentication and encryption at the IP layer, primarily used for VPNs or securing server-to-server communication, rather than for general inbound web access security for a public-facing SaaS solution.

A firewall is a fundamental security component that monitors and filters all incoming and outgoing network traffic based on predefined security rules. For a web-based SaaS solution, a firewall is essential for controlling inbound access by allowing legitimate traffic (e.g., HTTPS on port 443) while blocking unauthorized connection attempts and known malicious traffic, thereby protecting the solution's backend infrastructure.

Obfuscation is a technique used to make code or data less readable and harder to understand, typically employed to protect intellectual property or hide sensitive information within an application, and is not a mechanism for securing inbound network access.