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