A 45-yr-old patient presents with a 4 x 5 cm mass in the neck. Histopathological examination showed metastasis of squamous cell origin. The patient was thoroughly examined using laryngoscope, whole body CT and PET CT. No primary is found and the diagnosis of Carcinoma of unknown primary (CUP) is made. TNM staging as per AJCC is:
T1N1M0 T1N2M0 T0N1M0 T0N2M0