Outsourcing transportation services and using third$-$party logistics services $(3$PLs$)$ has $\_\_\_\_\_\_\_\_$blank.Multiple Choicedeclined as transportation has been re$-$regulateddeclined in popularity due to declining service provider performanceremained flat due to increased challenges of international logisticsincreased as organizations focus on core competenciesbecome increasingly popular with small organizations, but not large organizations