name for Function expression

Question

What does the code snippet to the right output by console.log?

Snippet

function a(){
}
const b = function() {
  
}

const c = function d() {
  console.log(typeof d)
  d = 'e'
  console.log(typeof d)
}

console.log(typeof a)
console.log(typeof b)
console.log(typeof c)
console.log(typeof d)
c()

Source

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