A 59-year-old man presents with a swollen, tender left calf following a long-haul flight. His Wells score for DVT suggests high probability. According to NICE guidance, what is the most appropriate initial management?AD-dimer test only and discharge if negativeBImmediate therapeutic anticoagulation and compression ultrasound within 4 hoursCWait for ultrasound results before starting anticoagulationDGive prophylactic-dose low molecular weight Heparin onlyENo treatment until symptoms worsenCheck my answer