Imagine you are going to find out how much deposit someone has in their bank account. I would appreciate it if you could tell me which one of the following self made sentences would sound natural in such a case to be asked:
a) How much is your deposits?
b) How much do you have in deposits?
c) How much do you have in your cash bank deposits?
d) How much deposit do you have in your bank account?
[This is a query between two close friends.]