The Vhal concept basically means $q,$

a$.$ Retailers take control of the vendor's inventory management.

b$.$ Vendors take over the marketing and discounting role at the retailers.

c$.$ Veridors $($suppliers$)$ take contsol of inventory management for the retailers.

d$.$ Vendors and retailers Jointly share in the inventory management responsibility.

e$.$ Vendors give price reductions to retallers as a reward for managing the retailers inventory.