Which elements are crucial for ensuring a scaffold's stability?

Ensuring a scaffold's stability is predominantly dependent on factors that affect its structural integrity and safety during use. The correct choice emphasizes the importance of having a secure base, maintaining level surfaces, and implementing proper anchorage. Each of these aspects plays a critical role in preventing accidents and ensuring the scaffold can safely support the loads placed on it.

A secure base involves placing the scaffold on a solid and stable foundation, which helps prevent tipping or shifting. Level surfaces ensure that the scaffold can evenly distribute weight, which is essential for maintaining balance. Proper anchorage refers to the methods used to tie the scaffold to a building or other structure, preventing it from moving or collapsing under unexpected forces or loads.

While other options touch on characteristics related to the scaffold, they do not address the immediate factors that directly influence stability, which are foundational for safe scaffolding practices.