A 40-year-old woman presents with a painful, swollen left calf 2 days after a long-haul flight. The Wells score suggests a likely deep vein thrombosis (DVT). What is the most appropriate next step according to NICE?AD-dimer test and no imagingBStart prophylactic-dose low-molecular-weight heparin onlyCImmediate proximal leg vein ultrasound within 4 hoursDArrange ultrasound within 7 daysEEmpirical oral anticoagulation for 3 months without imagingCheck my answer