Required for Save vs Required for save and submit

Here's the scenario I've got two buttons "Save" and "Save & Submit". On a form out of say 5 fields the save button requires 2 of these five fields to be entered in order to save. However, save and submit requires a total of 4 fields entered (2 needed for save and 2 more needed for save and submit). As an example assume I have fields:

• A
• B
• C
• D
• E

A & B are both needed to satisfy the clicking of "Save" button, and A,B,C, and D are needed to satisfy the clicking of "Save & Submit". I cannot just use an asterisk to show requirement because both C and D are not required for Save.

How should I in terms of what to show the user accomplish this in a way that isn't too confusing or busy? Obviously I dont want to do this:

• *A
• *B
• *C
• *D

Since a,b are only required for save. I also don't want to do something silly like

• *A
• *B
• **C
• **D

And put a footer note (* means required for save, ** means all required for * plus required for save and submit ) - to me that is a bit confusing just to even explain.

Please note I am using a simple example, the form has a lot more fields and is in a wizard type layout (prev/next) due to the amount of information.