Concerning the FTC v $.$ Morton Salt case $(1948),$ which of the following statements is $($ are $)$ true $?$ The Supreme Court ruled that Morton's practice of offering volume discounts to giant grocery retailers on its Blue Label salt violated $($ the ame of the Clayton Act $($ i$.$e$.,$ the Robinson $-$ Patman Act $).$ The Court ruled that small retailers suffered $"$ secondary line $"$ injury because they could not buy salt in sufficient quantities to qualify for the offered by Morton $.$ The volume discounts offered by Morton were available to any retailer that could buy sufficient quantities of salt $.$ All of the above statments are true $.$