Can form2 access existing form1 data

The resend notifications is strictly for sending an email containing either what you configured for the Admin Notification or the User Notification. You can then send that email to any email address you like. However, it isn't intended to be used to send a mass email.

If you want mass email newsletter capabilities I would suggest using MailChimp, Campaign Monitor or AWeber which are designed specifically for this and integrate with Gravity Forms via available Add-Ons.

What you describe in B) could be possible, but it's not a built in feature. To be honest virtually anything is possible via customizations. Gravity Forms is extremely customizable and has an extensive array of hooks and filters. But you have to know PHP and have a good understanding of WordPress development in order to create customizations.

There is Developer Documentation that explains and documents all of the available hooks. As to how to go about implementing specific customizations, you'd have to have a good understanding of what you are trying to do and how you'd typically do it using code and then see what hooks can make help you implement it.

We can typically provide high level guidance on the hooks that would probably be involved, but ultimately you or a developer would have to write the customization from that point on.