The correct answer is: D. MIMD
SISD (Single Instruction, Single Data) machines execute the same instruction on different data. SIMD (Single Instruction, Multiple Data) machines execute the same instruction on multiple data at the same time. MISD (Multiple Instruction, Single Data) machines execute multiple instructions on the same data. MIMD (Multiple Instruction, Multiple Data) machines execute multiple instructions on multiple data.
The Cray X-MP, IBM 3090, and Connection Machine are all MIMD machines. They can execute multiple instructions on multiple data at the same time. This makes them well-suited for parallel processing, which is the simultaneous execution of multiple tasks by multiple processors.
SISD machines are not well-suited for parallel processing because they can only execute one instruction at a time. SIMD machines are better suited for parallel processing than SISD machines because they can execute multiple instructions on multiple data at the same time. However, SIMD machines are not as well-suited for parallel processing as MIMD machines because they can only execute the same instruction on multiple data. MISD machines are not well-suited for parallel processing because they can only execute multiple instructions on the same data.
MIMD machines are the most versatile type of parallel processing machine because they can execute multiple instructions on multiple data. This makes them well-suited for a wide range of applications.