Fixed machinery should be properly what to prevent walking or moving?

The correct answer is anchored because this term specifically implies attaching machinery to its base or foundation in a way that prevents it from moving or shifting during operation. This is crucial for maintaining safety and operational efficiency, especially in a residential building context where vibrations or loads from machinery could lead to instability, hazards, or damage.

Anchoring ensures that fixed machinery remains in a designated location, thereby reducing the risk of accidents that could result from machinery unexpectedly shifting. It is also essential for compliance with safety regulations and standards that govern the installation of machinery in buildings.

While terms like stable, supported, and secured may imply some degree of prevention against movement, they do not convey the same specific requirement as anchoring. Stability can refer to how balanced a structure is, support may indicate the presence of additional bracing or reinforcements, and securing generally suggests that something is fastened but does not reflect the level of commitment to immobility that anchoring does.