What Is the Difference Between the Structural Stagnation Hypothesis and Secular

What is the difference between the structural stagnation hypothesis and secular stagnation theory?

A) Structural stagnation sees globalization as the cause of a stagnation, while secular stagnation sees too little investment as the cause.
B) Structural stagnation sees too little investment as the cause of a stagnation, while secular stagnation sees globalization as the cause.
C) Structural stagnation sees foreign countries moving down the value added chain as the cause of a stagnation, while secular stagnation sees foreign countries moving up the value added chain as the cause of a stagnation.
D) There is no difference, they both attribute stagnation to too little investment.