How do you handle don't cares when circling ones in a Karnaugh map?

[leonne]

Homework Statement

Question about don't cares in kmaps
in a 16 cell box
d 1 d 0
d 1 1 1
0 d 1 d
0 0 0 0
What do don't care stand for exactly? like when you do the circling of ones do you also include the D or you don't, even if the D are 1?
thxs

Homework Equations

The Attempt at a Solution

 

[MisterX]

You may treat d as 1 or 0. You should do so based on what allows for optimally simplified logic expressions.

 

[leonne]

o ok thxs