Consider a multilevel computer with different interpreters at Levels 1, 2, and 3. An interpreter between Levels 1 and 2 takes 4 instructions to process (fetch, decode, and execute) one instruction. However, an interpreter between Levels 2 and 3 takes 3 instructions to process (fetch, decode, and execute) one instruction. One instruction at Level 1 takes 1 nanoseconds to execute. How long does it take for an instruction at Levels 2 and 3?