What happens if you block all incoming connections in the "Firewall service" options in OS X?

Question

Options

• AYour Mac won't be able to obtain an IP address from a DHCP server.
• BFile servers on your local network won't be visible in the Finder's network browser.
• CFiles on your Mac that are shared using Personal File Sharing will be inaccessible to users on the
• DThe Mail application on your Mac will no longer receive incoming messages from a mail server.

• A
  5% (2)
• B
  15% (6)
• C
  70% (28)
• D
  10% (4)

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