Aclient undergoes a biopsy of a suspicious lesion. the biopsy report classifies the lesion according to the tnm staging system as follows: tis, n0, m0. what does this classification mean? a. no evidence of primary tumor, no abnormal regional lymph nodes, and no evidence of distant metastasisb. carcinoma in situ, no abnormal regional lymph nodes, and no evidence of distant metastasisc. can t assess tumor or regional lymph nodes and no evidence of metastasisd. carcinoma in situ, no demonstrable metastasis of the regional lymph nodes, and ascending degrees of distant metastasis