An otherwise healthy 50-year-old male presents with the pictured neoplasm on his trunk. Biopsy reveals melanoma, 2.3mm, ulcerated. Wide local excision and sentinel lymph node biopsy is performed, which is negative. What is the best next step?
A. Observation with skin checks q3 months and symptom-guided imaging
B. Adjuvant pembrolizumab
C. Adjuvant dabrafenib + trametinib
D. Adjuvant ipilimumab
E. Radiotherapy to the nodal basin