Before revision:  More importantly, we observe that the energy efficiency under { our C3 optimization framework improves by as much as 88 \% compared to any C2 optimization between communication and computation or caching.
After revision:  More importantly, we observe that the energy efficiency under {We numerically show that our C3 optimization framework improves by as much as 88 \% compared to any C2 optimization between communication and computation or caching.