Kaspersky Internet Security 9 Vs Kaspersky Anti-Virus 9?

Hello
I gotta couple of questions:

1. Whats the difference between the two?
2. Can I use it at the same time? (if) what will be the total RAM usage?
3. Kaspersky 6 is outdated. No more updates. But still running. Will this two kaspersky’s anti-virus 9 and Internet sec 9, run after expiration date?
4. If I wanted to use one which one do you think is the best? In wikipedia, Anti virus 9 lacks of what Internet sec 9 has.

Thnx for reading my question.
NOTE!!!

sory for double posting. I didnt know. I got disconnected and its says error so I went back and repost it. SOrry
Additional question for #1
Do internet security 9 has all the skills of Anti-virus 9?

NOTE:

I'm only asking for kaspersky

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