Roth's spots are specific findings observed during an eye examination, appearing as small, white, oval-shaped spots on the retina.
These characteristic retinal spots are most commonly associated with Infective endocarditis.
Consider the following statements with regard to pulmonary embolism :
1. Unexplained breathlessness is the most common symptom.
2. When congestive heart failure or pneumonia fail to improve despite standard medical treatment, occult pulmonary embolism should be considered.
3. Patients with high clinical likelihood of venous thromboembolism should first undergo D-dimer testing alone without obligatory imaging tests.
Which of the statements given above are correct?