What type of RAM retains its data when power is lost?

The type of RAM that retains its data when power is lost is not traditionally classified under the types listed in the options. Static RAM (SRAM) and Dynamic RAM (DRAM) both lose their data once power is removed; they are volatile memory types.

Static RAM uses a series of transistors to store each bit of data, while Dynamic RAM requires periodic refreshing of its memory cells to maintain the stored data. Consequently, both are dependent on a continuous power supply to retain information.

In contrast, Flash RAM, which is a non-volatile memory technology, does retain data even when the power is turned off, but this is typically not classified under traditional RAM types used for immediate computer memory tasks. Flash memory is more commonly used for storage solutions rather than as a type of RAM.

Thus, while the options present different types of memory, none fall into the category of RAM that would retain data upon power loss. Therefore, "None of the above" is the most accurate reflection of this question.