(a)   is a form of computer memory that can be read and changed in any order, typically used to store working data and machine code.

(a)   is a type of random-access memory that uses latching circuitry to store each bit.

(a)   is a type of random access semiconductor memory that stores each bit of data in a memory cell consisting of a tiny capacitor and a transistor, both typically based on metal-oxide-semiconductor technology

(a)   is a type of memory module containing random-access memory used in computers from the early 1980s to the late 1990s. It differs from a dual in-line memory module, the most predominant form of memory module today,

(a)   comprises a series of dynamic random-access memory integrated circuits. These modules are mounted on a printed circuit board and designed for use in personal computers, workstations and servers.

(a)   works by transferring data on both the leading and trailing edge of the clock cycle. The clock runs at the high speed of 400MHz.

(a)   is a generic name for various kinds of dynamic random access memory (DRAM) that are synchronized with the clock speed that the microprocessor is optimized for

(a)   is a double data rate synchronous dynamic random-access memory class of memory integrated circuits used in computers.

What are the other four types of DRR (You may use the abbreviations)

(a)