$8.$ Assume a JavaScript program includes $4$ commands. First, sync command $1$; then async command $2$; then async command $3$; then sync command $4$; then sync command $5.$ In what order it runs these commands.

Group of answer choices

First it runs sync$1,$ when sync$1$ ends it starts async$2,$ when async$2$ ends it starts async$3,$ when async$3$ ends it starts sync$4,$ when sync$4$ ends it starts sync$5.$

First it runs sync$1,$ when sync$1$ ends it starts async$2,$ while it is running async$2$ it starts async$3,$ while it is running async$2$ and async$3$ it starts sync$4,$ when sync$4$ ends it starts sync$5.$

First it runs sync$1,$ while sync$1$ is running it starts async$2,$ while it is running sync$1$ and async$2$ it starts async$3,$ while it is running sync$1$ and async$2$ and async$3$ it starts sync$4,$ while it is running sync$1$ and async$2$ and async$3$ and sync$4$ it starts sync$5.$

It runs all commands simultaneously.