Sending mms

Hello,
I'd like to ask about the following issue. As we all know, while sending an mms (ex. a photo) it's possible to add several recipients at the time, say A, B and C. And here's my question: if I send an mms like this and recipient A decides to send it back to me with his or her own comment, will recipients B i C receive that mms as well?
Do recipients A, B and C know, that the mms was sent not only to him or her, but to different recipients as well?

Thanks a lot!