【单选题】

This letter also provides procedures that can be used to help mitigate moisture ingress into the connector cavity until such time that the moisture problem can be resolved and a service bulletin is available to correct the problem.

A、If there is a available service bulletin to correct the problem of moisture ingress into the connector cavity,the letter then will be useless.
B、Refer to this letter to help mitigate moisture ingress into the connector cavity even if there is a available service bulletin to correct the problem.
C、If there is a available service bulletin to correct the problem that moisture ingress into the connector cavity, the letter then will provide procedures .