I have a question

In a dehydration synthsis reaction which of the following occurs
a. hydrogen and oxygen are removed from the reactant
b. water is added to the reactants
c. water is broken down into hydrgen and oxygen
d. both a and c
I think it would definitely be a and I think c also but I'm not sure about c

In a dehydration synthsis reaction, water is always a product

I think this is true
Thank you for checking