Which of the following generally do not qualify as a barrier to entry?

Tariffs and other burdensome international trade restrictions

The ability and willingness of industry incumbents to launch strong defensive maneuvers to maintain their positions and make it harder for a newcomer to compete successfully and profitably

The difficulties of building a network of distributors$-$retailers and securing adequate space on retailers' shelves

High capital requirements and the cost advantages enjoyed by existing industry members

Rapid market growth and low degrees of customer loyalty to existing brands