how often is the vCenter vpx user password automaticall…

By default, how often is the vCenter vpx user password automatically changed?

A.
15 days

B.
60 days

C.
30 days

D.
45 days

Explanation:
https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.security.doc%
2FGUID-96210743-0C17-4AE9-89FC-76778EC9D06E.html