Why does it say is not a function when calling a function?

Question

Vue.js

why in this example vue writes an error this.load2 is not a function ?

mounted() {
    console.log('mounted')
    this.load2()
  },
  
  load2() {
    console.log('load2')
  },

Answer 1

load2 - should be in

methods: {
  load2() {
    console.log('load2')
  }
}

Answer 2

Maybe because load2 is not present in the vue instance? You just need to understand what to do to make it appear