Which spam addon or combination to use?

Question

I see the following spam plugins on the q2a addons section - which ones should we be using as standard and which can we ignore?
Given we use bootstrap, it seems to me installing 1,3 and 6 would seem sufficient. Is that reasonable?

1. Akismet Plugin by Dave Hannon. Uses the Akismet spam filtering service to detect spammy posts and queue them for moderation.
2. AntiBot Captcha by Krzysztof Kielce. Simple and easy captcha for Q2A 1.5+.
3. Bootstrap reCAPTCHA by Amiya Sahu. A version of the default reCAPTCHA plugin that works well with Bootstrap-based themes.
4. KeyCAPTCHA Captcha by Andrey Gvosdev. Provides the KeyCAPTCHA captcha for Q2A.
5. Logical Captcha by Amiya Sahu. Shows simple logical questions from Text CAPTCHA as a captcha challenge.
6. Spammer Checker by Walter Williams @ Sawtooth Software. On IP address pages, checks stopforumspam.com and botscout.com to see if the IP belong to a known spammer
   
    

Answer 1

Only reCAPTCHA plugin is enough....if there are too many SPAM user registration then add extra field for user registration.