A server administrator is installing a 64-bit OS on a server hardware and receives the following error message: Processor architecture not supported. Which of the following architectures is causing…

ARM includes 64-bit variants (AArch64/ARM64) that fully support 64-bit operating systems, so ARM alone does not inherently cause this error.

x64 (AMD64/Intel 64) is itself a 64-bit architecture and is compatible with 64-bit operating system installers - it would not generate this error.

x86 is a 32-bit processor architecture that does not include the AMD64/Intel 64 instruction set extensions required to boot and run a 64-bit operating system. When a 64-bit OS installer detects a processor that only supports 32-bit execution, it immediately halts with an architecture incompatibility error. All other architectures listed - ARM64, x64, SPARC, and Alpha - have 64-bit variants that can run 64-bit operating systems.

SPARC has long-supported 64-bit execution and runs 64-bit operating systems such as Oracle Solaris, so it is not the source of this error.

Alpha (DEC Alpha) is a native 64-bit RISC architecture and was one of the earliest platforms to support 64-bit operating systems, so it would not trigger this error.