According to the National Terrorism Advisory System, how many alert levels are there?

The National Terrorism Advisory System (NTAS) actually identifies five distinct alert levels. Each level has specific criteria regarding the nature and immediacy of the threat, ranging from low to elevated threats. These levels help shape public awareness and preparedness regarding potential terrorist activities. The alert levels are:

1. Low - This indicates a general threat of terrorism.

2. Elevated - This suggests an increased threat of terrorist attacks.

3. High - This signifies a credible threat of imminent terrorist attack.

4. Imminent - This suggests that a credible threat is underway and that an attack is expected at any moment.

5. Special - This is used for a specific event that requires attention, like a national holiday or major event.

It's essential to be fully informed of the NTAS and its levels to understand how they impact preparedness and response to terrorism-related emergencies. The option indicating two levels does not accurately reflect the comprehensive structure that the NTAS provides, thereby failing to account for crucial levels of alerts that guide public safety and security protocols.