Given this code, what will puts D.greet output?

Given this code, what will puts D.greet output?

module M
  def self.included(base)
    base.extend(ClassMethods)
  end

  module ClassMethods
    def greet
      "Hi from M"
    end
  end
end

module N
  def self.included(base)
    base.extend(ClassMethods)
  end

  module ClassMethods
    def greet
      "Hi from N"
    end
  end
end

class D
  include M
  include N
end

puts D.greet