The correct answer is D. SPARC has 64 bits.
SPARC (Scalable Processor Architecture) is a RISC (Reduced Instruction Set Computing) instruction set architecture developed by Sun Microsystems. It was first released in 1987 and has been used in a variety of Sun Microsystems products, including workstations, servers, and supercomputers.
SPARC is a 64-bit architecture, which means that it can address up to 264 (18,446,744,073,709,551,616) bytes of memory. This is significantly more than the 232 (4,294,967,296) bytes of memory that can be addressed by a 32-bit architecture.
SPARC is also a register-based architecture, which means that it stores data in registers rather than in memory. This makes SPARC processors faster than processors that store data in memory.
SPARC is a widely used architecture and is supported by a variety of software vendors. It is a good choice for applications that require high performance and scalability.
The other options are incorrect. Option A is incorrect because SPARC is a 64-bit architecture, not an 8-bit architecture. Option B is incorrect because SPARC is a 64-bit architecture, not a 16-bit architecture. Option C is incorrect because SPARC is a 64-bit architecture, not a 32-bit architecture.