关于版本获取，正确的是（ ）Which statements are correc

以在版本管理系统中凭密码下载为主 Versions should be downloaded with password from the version management system.

必要时可采取FTP和光盘传送方式Versions can be sent via FTP or CD, if necessary.

禁止未经申请从非正常渠道获取Do not obtain versions from inappropriate channel.

从研发处获取Versions can be obtained from the R&D Department.