Describe the Blake & Mouton Managerial Grid and its five managerial styles. How can this model be applied to enhance effectiveness during organizational change?

John is the newly appointed COO of a company and is tasked with leading a company$-$wide digital transformation initiative. He's aware that his leadership style will significantly impact the success of this change.

a$)$ Which leadership style from the Blake & Mouton Grid would be most effective for John in this situation? Justify your answer.

b$)$ How can John incorporate elements from other styles in the managerial grid to create a more balanced approach to change leadership?