mrcem2-2201

You evaluate a 45-year-old woman with a swollen and red left calf. Her D-dimer levels are elevated, and you schedule an ultrasound scan, which confirms the presence of a deep vein thrombosis (DVT) in her left calf. She has no significant medical history and no reported drug allergies.
According to the current NICE guidelines, which of the following anticoagulants is recommended as the initial treatment for DVT?