How does N5X Distributed IDS/IPS keep up to date with signatures?

How does N5X Distributed IDS/IPS keep up to date with signatures?
A . NSX Edge uses manually uploaded signatures by the security administrator.
B. NSX-T Data Center is using a cloud based database to download the IDS/IPS signatures.
C. NSX Manager has a local IDS/IPS signatures database that does not need to be updated.
D. NSX Distributed IDS/IPS signatures are retrieved from updates.vmware.com.

Answer: D