Final answer:
All the listed steps - calibrating equipment, following safety procedures, and documenting observations - are crucial when using scientific equipment to ensure safe and accurate experimental results.
Step-by-step explanation:
When using scientific equipment, it is important to carry out several steps to ensure accurate and safe experimental work. Calibrating equipment before use is crucial for precise measurements. Secondly, one must always follow safety procedures and wear the necessary protective gear to prevent accidents and injuries.
Furthermore, it's essential to document readings and observations meticulously, as this allows for the verification of results and replication of the experiment by others. Therefore, when asked about the important steps when using scientific equipment, the answer is 'd) All of the above.' Each step is critical to maintain safety and accuracy within a laboratory setting.