Which OES NetWare module increases performance for multiprocessor systems and provides support for some hardware configurations from specific vendors?

LAN modules (LAN drivers) provide support for network interface cards and network communication, not multiprocessor performance or vendor hardware platforms.

The Host Adapter Module (HAM) supports storage controller adapters such as SCSI host bus adapters and has no role in multiprocessor or platform-level configuration.

The Custom Device Module (CDM) supports physical storage devices such as hard disks and CD-ROMs, not multiprocessor systems or vendor-specific platform configurations.

The HotPlug Support Module handles hot-pluggable hardware components and does not provide multiprocessor performance enhancements or general vendor platform support.

The Platform Support Module (PSM) is loaded at startup to allow NetWare to leverage multiple CPUs through symmetric multiprocessing, directly increasing performance on multiprocessor systems. It also contains OEM-specific code for hardware platforms from particular vendors, addressing specialized interrupt routing, bus architectures, or chipset behaviors. Without the correct PSM loaded, NetWare operates only on the primary processor regardless of how many CPUs are physically present.