88. Which of the following conditions must be met before a marine chemist will issue a certificate for a compartment to be «safe for workers, safe for hot work»?

The residues in the compartment must not be capable of producing any toxic gas under existing atmospheric conditions.
The concentration of combustible gases in the compartment's atmosphere must be less than 10 percent of the lower flammable limit.
The toxic gases in the compartment's atmosphere must be within permissible concentrations.
All of the above.

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