Which of the following statements regarding dyspnoea are True / False? a) Tripod positioned breathing, characterized by sitting with one's hands braced on the knees is indicative of increased airway resistance b) Paradoxical movement of the abdomen a sign of diaphragmatic weakness c) Left atrial failure should be considered when the patient complains of platypnea d) Raynaud's disease may be an indirect clue to the underlying pulmonary hypeension in a patient with dyspnoea e) If the hea rate is >85% of the predicted maximum an abnormality of the cardiovascular system is likely the explanation for dyspnoea