What is the hardware architecture of ARM?

$5$ points

Usually written as such today as Advanced Machine is a family of reduced instruction set computing $($ADM$)$ architectures for computer processors, configured for various environments.

Usually written as such today as Advanced RISK Machine is a family of enhanced instruction set computing $($RISK$)$ architectures for computer processors, configured for various environments.

Usually written as such today is a family of reduced instruction set computing $($RISC$)$ architectures for computer processors, configured for various environments.

Usually written as such today Machine is a family of complex instruction set computing $($CISC$)$ architectures for computer processors, configured for various environments.