Which Statement about personal firewalls is true?

Personal firewalls run within the operating system and share the same kernel, making them vulnerable to kernel-level attacks that can disable or bypass them.

Encrypting email messages and private documents is the function of VPNs or email encryption tools; a personal firewall controls network access but does not encrypt stored data or messages.

Personal firewalls protect only the individual host on which they are installed and cannot enforce policy for other devices on the network.

Personal firewalls inspect traffic directed at the host and can deny unsolicited probing requests such as port scans and ping sweeps, preventing reconnaissance against that specific system. This is the core host-level protection function of a personal firewall.