need with these question

Use the internet to check these sites; www.compaq.com, www.dell.com and www.gateway.com.what kinds of optical drives do these companies offer with their new computers? Do any of the companies offer multiple optical drives? If so, which ones and what devices? What upgrades for optical drives do the companies offer and how expensive are the upgrades? If you were buying a new PC, which optical drives would you want on your computer? Why