Which CSS snippet would set the border radius for a section element as shown in this screenshot?

border$-$radius: $020$ px $10$ px $20$px;

border$-$radius: $20$px $10$px $20$px $0$ ;

border$-$radius: $10$px $20$px $020$px;

border$-$radius: $20$px $020$px $10$px;