Which of the following types of bus can connect hard disk drives with the motherboard?

The RAM bus (memory bus) connects system RAM modules to the CPU memory controller and has no role in connecting storage devices.

NUMA (Non-Uniform Memory Access) is a multiprocessor memory architecture concept describing latency relationships between CPUs and memory regions, not a physical bus for storage devices.

The CPU bus connects the processor to the chipset or other CPUs and is not designed for connecting peripheral storage devices.

SATA (Serial Advanced Technology Attachment) is a bus interface and physical connector standard designed specifically for attaching storage devices such as HDDs and SSDs to the motherboard, providing both the data pathway and the command protocol (AHCI) for storage communication. It replaced the older parallel ATA standard and remains the primary interface for internal consumer storage devices.

There is no industry-standard hardware bus called the 'Auto bus'; this is not a real storage or system interconnect technology.