I have 2 questions about LE Secure Connections.

I have 2 questions about LE Secure Connections.

1. What are the decisions of PKa and PKb passed in "2.3.5.6.1 Public Key Exchange" of BLUETOOTH SPECIFICATION Version 4.2 [Vol 3, Part H]?

2. Is "2.3.5.6.2 Authentication Stage 1 - Just Works or Numeric Comparison" of BLUETOOTH SPECIFICATION Version 4.2 [Vol 3, Part H] not encrypted?
Also, from what stage will it be encrypted?