A customer needs a remote data copy， data migration， and off-site backup solution. The solution cannot impact application performance. The sites are over continental distances.  Which  characteristic of DS8700 Global Mirror makes it a good fit for this customer（）

• A、it provides synchronous mirroring on both sides
• B、it can be implemented withoutFlashCopy volumes at the target site
• C、with Global Mirror， the Metro Mirror functions can be used over continental distances
• D、it has almost no impact on application performance because of its extremely short and adjustable coordination time