Regarding the enhanced mode in HTTP Flood source authentication, which of the following descriptions are correct? Multiple choices

Regarding the enhanced mode in HTTP Flood source authentication, which of the following descriptions are correct? Multiple choices
A . Enhanced mode refers to the authentication method using verification code.
B. Some bots have a redirection function, or the free proxy used during the attack supports the redirection function, which leads to the failure of the basic mode of defense Effective, enhanced mode can effectively defend.
C. The enhanced mode is superior to the basic mode in terms of user experience.
D. Enhanced mode supports all HTTP Flood source authentication fields. "

Answer: A,B