Using C, why would a char * type be of size 2 in one place, but 4 in another?

From a question on the Practice C test from GeekInterview, why is the size of ptr1 2, while ptr2 and ptr3 are size of 4?

main() 
{ 
char near * near *ptr1; 
char near * far *ptr2; 
char near * huge *ptr3; 
printf("%d %d %d",sizeof(ptr1),sizeof(ptr2),sizeof(ptr3)); 
}

Output: 2 4 4

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