After 
1. e4 e6
2. d4 d5
3. Nd2 Nf6
4. e5 Nfd7
5. Bd3 c5
6. c3 b6
7. Ne2 Ba6
8. Nf3 Bxd3
9. Qxd3 

A. 
is Black's plan correct with closing the center with 9....c4 then continue the plan with the pawn storm in queen's side with b5, then later a5, a4 and so on.

B. 
or better for black to keep tension at d4 pawn and don't advance the c5 pawn ?

C. 
the same question as above, if I keep the tension a little longer for example
1. e4 e6
2. d4 d5
3. Nd2 Nf6
4. e5 Nfd7
5. Bd3 c5
6. c3 b6
7. Ne2 Ba6
8. Nf3 Bxd3
9. Qxd3 Nc6
10. 0-0 Rc8
11. Be3 

should Black immediately go with 11...c4 ? with plan A as above ?

thanks for opinion