Why was Snape teaching DADA?

[Tammy]

No: HPFGUIDX 135913

anuja wrote:
> I am not sure why we saw Snape teachind DADA this year.Is it: 
> 1.because Dumbledore finally tusts him so much that he thinks it wont 
> do any harm
> 2.because he cant (yet again)find a DADA teacher but knows he can
> find 
> another one for potions.so after getting a new teacher for potions he 
> had no choice but to let Snape teach DADA?
> 3.or because he always intended to get the memory from Slughorn and
> so 
> needed him at Hogwarts?
> 
> Anuja.

Tammy now:

Or is it:
4. Snape told Dumbledore about the Unbreakable Vow, that bonded him to
either help Draco kill Dumbledore, kill Dumbledore himself, or to die.
Seeing as how Dumbledore knows Snape will be dead or gone by the end
of the year (I agree with the
Dumbledore-made-Snape-kill-him-to-get-in-with-Voldemort camp) and
therefore granted Snape's last wish - to teach DADA. It shows LV that
Dumbledore trusts Snape completely at last (meaning Snape has done his
job well), and gets Sluggy to Hogwarts to teach the last memory. 

-Tammy, who wonders if the popular Dumbledore-Snape theory has a name yet?