How many entity colours does AutoCAD support? (a) 255 (b) 16 (c) unlimited (d) 64

Option A is the right choice.

Thanks for the invite. Sorry, I do not know the answer.

supports 255 colors answer (A)

There are 255 index colors. Using True color or Color Books you can have many more colors. But not unlimited, so I'd go for 255.

yes correct answer is255 Thanks 

sorry not idea how many colours are included.

Thank you for the invitation

Option A

With greetings and appreciation