A59-year-old male presents with sudden-onset severe lower back pain. he is conscious and alert, but very restless and diaphoretic. your assessment reveals a pulsating mass to the left of his umbilicus. you should: select one: a. vigorously palpate the abdomen to establish pain severity. b. place the patient in a sitting position and transport at once. c. request a paramedic unit to give the patient pain medication. d. administer oxygen and prepare for immediate transport.