Which of the following statements is true about L3 cache?

L3 cache is slower than the CPU and L1/L2 caches, not faster.

L1 and L2 caches usually run at or close to the processor's core speed, but L3 often runs slower, at system bus speed.

15ns is a very slow access time, typical of main system RAM latency, not high-speed CPU cache memory which operates in picoseconds or single-digit nanoseconds.

L3 cache is typically the largest and slowest cache level, often shared across multiple CPU cores, and it commonly operates at the speed of the system bus (Front Side Bus or equivalent) to bridge the speed gap between the CPU and main memory. This design allows it to serve as a victim cache or a shared cache for L1 and L2, but at a lower speed than the core itself.