Behindu I'd also agree that Scenario E (oddly missing from the original list ) represents the current situation for home fans, and don't think the fact that home and away fans are policed differently is of any relevance.
Scenario E was omitted because it just quite clearly isn't realistic.
Like it or not, people are going to stand at times that are deemed inconvenient for those around them. Some people want to stand. FACT.
The sooner a policy is formulated that deals with this reality the better I believe. This is the sensible way forward.
Burying your heading in the sand and believing that everyone can sit in a nice ordily fashion and cheer and stand in unison is living in cloud cuckoo land.