Async/await serial vs paralel

serialParalel.js

const firstPromise= () => (new Promise((resolve,reject) => {
  setTimeout(() =>{ resolve('first Promise')},1000) 
}))

const secondPromise = () => ( new Promise((resolve,reject) =>{
  setTimeout(() =>{ resolve('second Promise')},1000) 
}))

const thirdPromise = () => ( new Promise((resolve,reject) =>{
  setTimeout(() =>{ resolve('third Promise')},1000) 
}))
 
async function asyncParalel() {
  let a =firstPromise()
  let b= secondPromise()
  let c= thirdPromise()
  console.log('done')
}
 
async function asyncSerial() {
   let a= await firstPromise()
   let b= await secondPromise()
   let c= await thirdPromise()
   console.log('done')
}