How is the actor$/$observer bias different from the self$-$serving bias?

a$.$ Those who use actor$/$observer bias may become less popular than those who use self$-$serving bias.

b$.$ Actor$/$observer bias is used as a last resort when others will not accept self$-$serving bias.

C$.$ People using the self$-$serving bias may attribute the success of others to that person's traits, something not done by those using actor$/$observer bias.

d$.$ Self$-$serving bias is used only by people attributing their own success or failure; actor$/$observer bias is also used to attribute the success and failure of others.