During repairs it is necessary to replace an existing vessel bulkhead. Drawings indicate the bulkhead is A60. "A" indicates which of the following?
"A" class bulkheads must not allow flame or smoke passage for 15 minutes when subjected to a fire test
"A" class bulkheads must not allow flame or smoke passage for 30 minutes when subjected to a fire test
"A" class bulkheads must not allow flame or smoke passage for 60 minutes when subjected to a fire test
"A" class bulkheads must not allow flame or smoke passage for 120 minutes when subjected to a fire test
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