【单选题】【消耗次数：1】
商品化会计核算软件开发经销单位在售出软件后应承担售后服务工作，在下列工作中( )不是软件开发销售商必须提供的
①
对用户进行软件使用前的培训
②
对用户的软件进行维护
③
对用户的硬件进行维护
④
对用户的软件版本进行更新
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