802.11 is a Wi-Fi standard, not a frequency, both of those operate at 2.4 GHz. Bluetooth operates at frequencies between 2402 and 2480 MHz, or 2400 and 2483.5 MHz.
Answer: Most obvious spam messages will still reach the client computer
Explanation:
It should be noted that by default, usually the junk email filter is already set to No Automatic Filtering.
When a user configures No Automatic Filtering in Junk Mail Options, it should be noted that most obvious spam messages will still reach the client computer.
Therefore, the correct option is D.
