Protected Benefit question

Plan allows for partial withdrawals so long as the amount is at least $85.

Is this a protected benefit?  If so, can the client change the minimum amount or is that protected as well?

Optional forms of payment are protected benefits. However, if a DC plan meets the requirements in 1.411(d)-4 Q&A 2 (e), it can eliminate an optional form of payment.  So, it may be possible to eliminate the current partial withdrawals and replace it with a new one.

Or to just eliminate it.