Why are SSID not considered to be a good security mechanism to protect a wireless network?

On wireless networks, a SSID is used to identify the network. Why are SSID not considered to be a good security mechanism to protect a wireless network?

A.
The SSID is only 32 bits in length

B.
The SSID is transmitted in clear text

C.
The SSID is to identify a station not a network

D.
The SSID is the same as the MAC address for all vendors

Explanation:
The use of SSIDs is a fairly weak form of security, because most access points broadcast the SSID, in clear text, multiple times per second within the body of each beacon frame. A hacker can easily use an 802.11 analysis tool (e.g., AirMagnet, Netstumbler, or AiroPeek) to identify the SSID.