Help!

If am I ending my sentence with the word 7 a.m., which is correct?

a. 7 a.m. (one period because it is the end of the sentence)
b. 7 a.m.. (two periods because of the one after the letter "m" and the period at the end of the sentence)

Respuesta :

It would be one period.
Tuniss
 A. 7 a.m. (one period because it is the end of the sentence)

No period at the end. 

And sorry, I opened this question and forgot about it. 
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