ESD caused by the human body can be a result of which of the following activities? (Select all that apply)

Wearing synthetic clothing is a common activity that can lead to electrostatic discharge (ESD) caused by the human body. Synthetic materials, such as polyester and nylon, do not conduct electricity well and can easily accumulate static charges through friction with other materials or even through the movement of the wearer. When the accumulated charge reaches a certain threshold, it can discharge, potentially damaging sensitive electronic components.

While other activities listed may also contribute to ESD risks, wearing synthetic clothing is particularly relevant because it directly influences the buildup of static charge on the body. Engaging in activities like rubbing or separating materials, walking on concrete floors, and operating electronic devices have varying levels of impact but are less directly associated with the generation of static electricity in the same way synthetic clothing is known to cause. Understanding the source of ESD is crucial for implementing appropriate preventive strategies in avionics and electronics environments.