Each life jacket light that has a non-replaceable power source must be replaced（）.<br>A:every 6 months after initial installation<br>B:every 12 months after initial installation<br>C:every 24 months after initial installation<br>D:on or before the expiration date of the power source

Each life jacket light that has a non-replaceable power source must be replaced（）.
A:every 6 months after initial installation
B:every 12 months after initial installation
C:every 24 months after initial installation
D:on or before the expiration date of the power source

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