Can This Boolean Equation Be Simplified Further?

[Jordash]

Homework Statement

I came to an equation which looks like this:

AB'D' + AC'D' + CD'

I know I can simplify out the C to this

AB'D' + AD' + D'

Any further simplification available (And am I simplifying properly so far?)

Thanks

Homework Equations

The Attempt at a Solution

 

[Jordash]

Actually would I be correct in saying that all like terms would be combined? because D'+D'+D'=D' so the simplified form of the equation above would be AB'+D'

Is that right or am I completely crazy?