What is the IP address of responses via LVS DR?

[SAMPATHKUMAR KISHORE KANIYAR <sampatki@xxxxxxxxxxxx>]

  LVS folks,
  
  I am new to LVS, and have been configuring and using LVS and learning
  how LVS works.
  
  I have a question about LVS-DR. Look at the following configuration:
  
                                    A  ---------------
                    ------------------| LOAD BALANCER |
                   |                   ---------------
                   |                          | A'
                   |                          |
                   |                          | 
                   |                      -------- 
                   |             --------| Switch |------- 
                   |            |         --------        |
                   |            |                         |
                   |            | B'                      | C'
                   |        ----------                 ---------- 
                   |       | SERVER 1 |               | SERVER 2 |
                   |        ----------                 ----------
                   |            | B                       | C
                  _____         |                         |
                 /     \        |                         |
  --------      /       \       |                         |
 | CLIENT |----| Gateway |---------------------------------
  --------      \       / 
                 \_____/
  
  
  I have indicated the N/W inteface cards for the Load balancer and
  the Servers by A, A', B, B' and C, C' respectively.
  
  Also, let us say the IP address for N/W interface card A on Load
  balancer is configured to the Virtual IP: VIP.
  
  When the Client request to VIP is directed by the load balancer to
  Server 1 (say), my understanding is that it is received by
  Server 1 on N/W interface card B', which will have a loopback
  alias interface configured with IP address VIP.
  
  I have 2 questions about Server 1 "responding" to the "client":
  1) Server 1 responds to the CLIENT on N/W interface card B, right?
  2) If so, what is the IP address returned in the response packet?
     Isn't it the IP address configured for N/W interface card B,
     which is -not- VIP? But, the client knows/expects only VIP.
  
  Can someone clarify?
  
  Thanks,
  - Kishore