Option 3 but be sure to add a door.

Option 3 allows separation of toilet for two to use bathroom at the same time

Modified Option 3: your shower is unnecessarily skinny. I'm estimating that the space available for the shower and the toilet is about 80" wall-to-wall. The toilet needs a minimum of 30" (15" on either side of the centerline). You could make that shower 45"-48" wide and still have more than enough room for the toilet. And, believe me, having a different proportion in the shower will make a world of difference.

@kudzu9 - something like this?

rehaire-

Exactly...a much more optimal use of your space. :-)