The anhydride shown reacts with nucleophiles. Which statements are correct?

1. AWith ethanol it gives an ester and a carboxylic acid
2. BWith excess ammonia it gives an amide and an ammonium carboxylate
3. CIt is more reactive than the corresponding ethyl ester because carboxylate is a better leaving group than alkoxide
4. DIt is less reactive than the corresponding acid chloride but more reactive than a simple amide