Which statement about SSIDs is correct?

SSIDs (Service Set Identifiers) are case sensitive, meaning "MyWiFi" is considered different from "mywifi" or "Mywifi." Wireless clients must use the exact casing to connect to the correct network. SSIDs do not require a number and a letter; they can be purely alphabetic, alphanumeric, or special characters, as long as they are between 1 and 32 characters long. SSIDs are an industry-standard feature, not proprietary to Cisco, and are used across all Wi-Fi networks. While a wireless network can be configured to map to a specific VLAN, the SSID itself does not define the VLAN; it merely identifies the wireless network.