Consider a series of allocation and frees by a program: a == == o' = void *a = malloc(4); // Assume allocation is created at offset 0, eg: void *b malloc(4); void *C = malloc(4); void *d malloc(4); void *e = malloc(6); free(a); free(c); free(d); void *ptr malloc(6); = If allocations are made using a best-fit allocation strategy with a being initially allocated at (decimal) location 0, what is the offset of ptr (using decimal)? ptr = integer