Which of the following technologies allows a single physical processor to do the work of multiple processors?

Symmetric multi-processing (SMP) describes an architecture where multiple separate physical processors share a common memory, rather than a single physical processor doing the work of multiple.

Multicore processors contain two or more actual processing units on a single chip, each capable of executing instructions independently. This design allows a single physical CPU package to process multiple threads or tasks simultaneously, effectively doing the work that would otherwise require multiple separate physical processors.

64-bit processing relates to the data width a processor can handle, allowing for larger memory access and data processing, but it does not make one physical processor perform the work of multiple.

Hyper-V is Microsoft's hypervisor technology for virtualization, which enables running multiple operating systems on a single physical server, but it is not a technology that makes a single physical processor perform like multiple.