The select option has 2 options. "Can" and "Can not"

I am a little confused. Should be really simple. Just which combination is correct.

1. An allocator [ Select ] move allocated blocks to the end of the heap to maximize throughput. 2. An allocator [ Select ] pad a heap block to meet memory alignment requirements. 3. An allocator [ Select ] A handle heap requests in an arbitrary order by reordering them to improve heap memory utilization. 4. An allocator [ Select ] - use the uninitialized data segment to satisfy heap requests if needed. 5. An allocator [ Select ] - create larger free blocks by coalescing adjacent free blocks when needed