Which memory architecture allows for 4 billion address locations?

The correct answer is based on the capabilities of the 32-bit memory architecture. A 32-bit system can address up to 2^32 memory locations, which totals 4,294,967,296 unique addresses. This amount is often rounded down to approximately 4 billion when discussing memory addressing limits in practical terms.

This architecture allows for each address to point to a byte; therefore, 4 billion addressable locations translates into about 4 gigabytes (GB) of memory space that the system can utilize. This is a significant characteristic of 32-bit systems, where the maximum usable memory in practical applications is often closer to 3 to 3.5 GB due to various system and hardware reserved addresses.

In comparison, while a 64-bit architecture can theoretically address an immensely larger space (2^64 addresses), which is many terabytes of RAM, it is not relevant to the immediate question regarding the limit of 4 billion address locations. The other options regarding single bank memory module and paired bank memory module pertain to configurations of physical memory rather than the overarching architecture and addressing schemes, thus further distinguishing the correct answer based on the explicit question criteria.