Answer:
a) Disable SSID (Service Set Identifier) broadcasting
Step-by-step explanation:
You must perform the following steps:
1. Disable SSID Broadcast. When making the change in the Wi-Fi network, a warning from an unidentified network.
2. Lower Radio Power Levels,
3. Enable MAC Filtering (MAC filtering is used to restrict access of certain devices to your network, this is another security measure for your router).