Alliance SOC - Logo Concepts

Alliance Security Operations Center is a consortium of security guard companies who can outsource their Security Operations Center - "alliance" means a union or association formed for mutual benefit ???
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When brainstorming concepts for their logo i was drawn towards a hub or various elements coming together forming an A, and that's how the concepts on the right where created. I also wanted to test with a concept that was more focused on the security aspect, so i created an A that resembles a Lock - the third concept ???
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My client, Jason, asked me to share these with you and ask for your feedback on them - what's your thoughts, any particular favorite?

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