The requirement for a transportation problem to have feasible solutions is

Group of answer choices

if and only if the sum of its supplies equals the sum of its demands.

if and only if the sum of all resources available equals the minimum of all resources demanded.

if and only if the maximum of all the supplies equals the maximum of all the demands.

if and only if the cost per unit of all supplies equals the cost per unit of all demands.

if and only if the unit cost of all supplies is directly proportional to the unit cost of all demands.