What is the difference between an American style option and a European-style option? a) American style option are only available to institutional investors whereas European options are available to retail investors. Ob) European options are only available in Europe while American options are available everywhere except Europe. Oc) American style options can be exercised on any date up to expiry whereas European options can only be exercised on expiry date. O d) European style options are only available as call options whereas American options are availabre as both calls and puts