Type one PC cards: A. are used only in desktops B. are no longer being produced C. are the thinnest of the PC cards D. don’t exist E. have their own power source

The correct answer is: B. are no longer being produced.

Type I PC cards are the oldest type of PC card, and they are no longer being produced. They are the thinnest of the PC cards, and they do not have their own power source. They are used in a variety of devices, including laptops, PDAs, and digital cameras.

Here is a brief explanation of each option:

• A. are used only in desktops. This is incorrect because Type I PC cards can be used in a variety of devices, including laptops, PDAs, and digital cameras.
• B. are no longer being produced. This is the correct answer because Type I PC cards are the oldest type of PC card, and they are no longer being produced.
• C. are the thinnest of the PC cards. This is correct because Type I PC cards are the thinnest of the PC cards.
• D. don’t exist. This is incorrect because Type I PC cards do exist.
• E. have their own power source. This is incorrect because Type I PC cards do not have their own power source.