Which one of the following is not a part of situational theories of leadership?

In standard classifications of leadership theories, "Fiedler's contingency model", House's "Path goal theory", and Hersey and Blanchard's "Life cycle theory" are the core situational (contingency) theories of leadership. By contrast, Tannenbaum and Schmidt's "Leadership continuum" is classified under behavioural style models depicting styles ranging from boss-centred to subordinate-centred leadership.