Which statement is true regarding the Junos OS?

All Juniper platforms running the Junos OS, regardless of their specific hardware, use the same unified source code base, ensuring consistent feature sets and operational behavior.

While the core Junos OS is consistent, the Packet Forwarding Engines (PFEs) often vary significantly between different Junos platforms to accommodate diverse performance and feature requirements.

Not all platforms running Junos OS use hard drives for storage; many use solid-state drives or flash memory, especially smaller or more modern devices.

While the Junos OS uses a separate process with protected memory space, stating 'for each' might imply every single function has its own process, which is an oversimplification; the broader statement about a single source code base is a more fundamental and universally true characteristic across all platforms.