Embedded Structs interview question

embed_struct.go

package main

import "fmt"

type A struct{}
type B struct {
	A
}

func (a A) HiThere() {
	fmt.Println(a.secret())
}

func (a A) secret() string {
	return "Hi there I'm A"
}

func (b B) secret() string {
	return "Hi there I'm B"
}

func main() {
	a := A{}
	b := B{}
	a.HiThere()
	b.HiThere()
}

// What is printed and why?