Different types of EPS in Photoshop

I was going to save an image created using Photoshop and I wanted to save it as .EPS but I see there are 3 different types of EPS available:

• Photoshop EPS (*.EPS)


• Photoshop DCS 1.0 (*.EPS)


• Photoshop DCS 2.0 (*.EPS)

What is the difference between them?

Then an options window opens asking for preview, encoding and other things.

What is the meaning of all these options? I mean, how they influence the quality of the image?