Which of the following is generally not considered as a barrier to entry?

High capital requirements

The cost advantages enjoyed by industry members due to scale economies $($in production, distribution, or other activities$),$ favorable locations, and$/$or low fixed costs

Weak brand preferences and low degrees of customer loyalty to existing brands

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

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