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Which of the following types of PC cards can be used in a Type III PC Card slot?

  1. Type IV PC Card

  2. Type II PC Card

  3. Type I PC Card

  4. Type III PC Card

The correct answer is: Type I PC Card

A Type III PC Card slot is designed to accommodate Type III PC Cards, which are 10.5 mm thick. It can also accept thinner cards, which includes Type II PC Cards and Type I PC Cards, both of which have thicknesses of 5.0 mm and 3.3 mm respectively. This compatibility means that any card that is thinner than the standard thickness of the slot is able to function in it. The reasoning behind this is based on the physical design and specifications of PC Card slots, which are built to accept cards of equal or lesser thickness. Therefore, the Type III PC Card can perfectly fit into its designated slot, and it can also support multiple thinner types. In contrast, while other card types like the Type IV PC Card are available, they are actually thicker than a Type III slot can accommodate, making them incompatible. This understanding of slot compatibility is crucial for effectively utilizing and installing PC cards in various devices.