7 is Mormons baptizing dead people. Did you mean 8 and 9?
Whoops you're right...
I ended up agreeing with the same ones as you. I'm pretty sure this is roughly the standard broad-view officially taken in our respective churches.
Yes and that's largely to be expected. For a baptism to be valid:
-It must be done with the Trinitarian formula
-It must use water (sprinkling and total immersion are both acceptable)
-It must use the verb baptize or something similar if in another language there is another word for it, ie. "I baptize you..."
-The person being baptized must not already be baptized.