2) A guaranteed rate or stable value option
Think a government money market fund is the answer? Those funds have an even lower yield than prime money market funds. Clients' employees deserve the opportunity to invest their money safely, without the prospect of loss and with a reasonable return.
3) Participant investment advice
Providing access to these services is the right thing to do. Costs range from free to expensive. Many recordkeepers provide the option of free services along with a fee-based option, allowing employees to decide which is best for them.