<prompt> With references to vasectomy, consider the following statements : Non-scalpel vasectomy and conventional vasectomy have complication rates of 0.4 and 3 respectively When sperms are absent from two consecutive samples of semen, the vasectomy is considered complete for contraception1 Only2 onlyBoth 1 and 2Neither 1 nor 2  <response>: 2 only 