What features are typically associated with postmodern fiction?

Explanation:

Postmodern literature is a form of literature which is marked, both stylistically and ideologically, by a reliance on such literary conventions as fragmentation, paradox, unreliable narrators, often unrealistic and downright impossible plots, games, parody, paranoia, dark humor and authorial self-reference.

yes the first one is correct .

as for symbolic actions, the narrator's tearing down the wallpaper in an attempt to find the "woman" in the wallpaper represents her struggle to retain or regain her sanity.   the wallpaper has been part of her confinement and by her tearing it down, she is freeing herself from that confinement.