What are features and benefits of Remote Support Manager？（） 1.Built in firewall 2.Runs on Linux and Windows servers 3.Collect support data 4.Allow remote maintenance 5.Can support up to 50 DS5000/DS4000/DS3000 storage servers 6.Minimum annual fee
- A1，2 and 5
- B1，5 and 6
- C2，3 and 6
- D1，4 and 5