Workforce compensation: Automatically Rank Worker

Summary: How this feature works - 'automatically rank worker'

Content (required):

Let's say we have manager hierarchy -

A --> B --> C --> D

A --> E --> F --> G

Where A is top manager, D and G are bottom manager

Let's say Total 12 workers reports to manager A from hierarchy B and E

Question is

1) What is automatic ranking?

2) How automatic ranking gets derived?

3) Do I need to run process to get derived automatic ranking?

4) If I don't enable "Rank workers - Automatically" then how it behaves? how rank get derived?

5) Where can i see Retain Ties or Arbitrarily Resolve Ties?