We can use singular or plural verbs with many collective nouns ... mixed as are the pronouns that refer back to the nouns in the previous sentence. So, all four of your options are correct.

One for sorrow, two for joy… and three magpies can be a tiding, a charm, or a gulp. A collective noun is used to describe a group or collection of things as a whole. A collective noun that ...

Here are some examples: The people are loud ... Gonna go ahead and rate some players based on collective nouns. Oh yeah, the reason I’m doing this is because of the NC State Wolfpack, their ...