Increment can be released mid-Sprint if necessary. True or False?

Which is the event to make integration issues Transparent?

All the Scrum Teams in a Nexus should have the same Sprint start date

There can be two product backlogs in a Nexus. True or False?

A five team Nexus is developing a purchase order application. There are several dependencies and Nexus faced a lot of challenges in managing them.
How should they conduct their Nexus Sprint Planning to minimize such difficulties due to the dependencies?