$192021222324252627$Incorrect. $1$:$1$ indicates a one$-$to$-$one relationship, which would mean that each customer may redeem only one coupon, and that each coupon may be redeemed by only one customer.Correct. $1$:$1$ indicates a one$-$to$-$one relationship, which would mean that each customer may redeem only one coupon, and that each coupon may be redeemed by only one customer.Incorrect. $1$:$1$ indicates a one$-$to$-$one relationship, which would mean that each customer may redeem only one coupon, and that each coupon may be redeemed by only one customer.Incorrect. $1$:$1$ indicates a one$-$to$-$one relationship, which would mean that each customer may redeem only one coupon, and that each coupon may be redeemed by only one customer.