Valid character strings for different optimization routines

What are the valid character strings for the options argument in function mark ?
Supplying a nonsense character string did not return any warning, nor a list of the valid options. I believe simulated annealing and MCMC are the only alternatives to the default Newton-Raphson routine, but I don't know what string would follow the proc estimate statement in the *inp file mostly because I started using RMark before I started using Mark.
Thanks.
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mark(data.proc, data.ddl, options="?", . .
Supplying a nonsense character string did not return any warning, nor a list of the valid options. I believe simulated annealing and MCMC are the only alternatives to the default Newton-Raphson routine, but I don't know what string would follow the proc estimate statement in the *inp file mostly because I started using RMark before I started using Mark.
Thanks.