AWS SDK for .NET Documentation
Permanent Property
AmazonAmazon.RDS.ModelOptionGroupOptionPermanent Did this page help you?   Yes   No    Tell us about it...
A permanent option cannot be removed from the option group once the option group is used, and it cannot be removed from the db instance after assigning an option group with this permanent option.
Declaration Syntax
C#
public bool Permanent { get; set; }

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)