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What is Characteristic feature of Otosclerosis are all except- and explain in detail?
You are aware of all options given in Question.
Just Remember: The following otoscopic findings in otosclerosis.
Remember:

Tympanic membrane is normal and mobile in 90% cases. (i.e. option d is correct).
Schwartz sign—Flammingo cases pink colour of tympanic membrane is seen in 10% cases. It indicates active focus with increased vascularity.
Stapes footplate—Shows a rice grain / biscuit type appearance
Blue mantles are seen histopathologically.