I have 2 dark bay quarter horses and one does reining, roping and cattle and the other one does really anything like english, western pleasure and barrels etc.
Can you choose more than one option?
Because a conclusion should not repeat word-for-word the introducion (this would make it actually pretty redundant), but other than this, it should be all of the remaining! (but if i had to choose one, I'd go with "summarize the main points- this would be most effective and most relevant./)
So my answer is: it should restate the thesis AND summarize the main points AND be imaginative
but it should NOT repeat the introduction word-for-word.