你正在写一段可以在一个事务处理中执行两个命令strCom1 and strCom2的代码，你已经写了以下这些代码（行号只是作为参照作用）01 Dim transMain as SqlTransaction = connMain.BeginTransaction02 Dim cmdMain as SqlCommand = New SqlCommand 0304 cmdMain.CommandText = strCom1 05 cmdMain.ExecuteNonQuery()06 cmdMain.CommandText = strCom2 07 cmdMain.ExecuteNonQuery() 08 transMain.Commit 09 connMain.Close以下哪一行代码可以放置于03行？

A. transMain.Save
B. transMain.RollBack
C. cmdMain.Connection = connMain
D. cmdMain.Transaction = transMain