About "serve"

Can I say,

(a) Then, she stirs the scrambled eggs with the spatula until they are cooked. When they are cooked, she serves it with toast.

(b) Then, she stirs the eggs mixtures with the spatula until it is cooked. When it is cooked, she serves them with toast.

(c) .... When it is cooked, she can serve it with toast.

(d) ... When it is cooked, it is ready to be served with toast.

(e) ... When they are cooked, they are served with toast.

(f) ... When they are cooked, it is served with toast.