How to get value from second level pointer in Parse for iOS using Objective-C

I have the following structure in Parse

Class_A

• ObjectId
• b_ID (this is a pointer having a value as objectID for B)

Class_B

• ObjectId
• c_ID (this is a pointer that has a value as objectID for C)
• someParameterinB

Class_C

• ObjectId
• someParameterinC

I am using the following code to extract;

PFQuery *query = [PFQuery queryWithClassName:@"Class_A"];
    [query includeKey:@"b_ID"];
    [query includeKey:@"Class_B.c_ID"];

    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (!error) {
            // The find succeeded. The first 50 objects are available in object
            self.myArray = [[NSArray alloc] initWithArray:objects];
        } else {
            // Log details of the failure
            NSLog(@"Error: %@ %@", error, [error userInfo]);
        }
    }];

      

        
        
        
      

    

Now when it comes to displaying in a UITableViewCell, I am using the following code:

PFObject *aObject = [self.myArray objectAtIndex:indexPath.row];

PFObject *bObject = [aObject objectForKey:@"b_ID"];

PFObject *cObject = [bObject objectForKey:@"c_ID"];

      

        
        
        
      

    

I have a problem with cObject. Could you help me?