The correct answer is: B. A wrist strap
A wrist strap is a personal grounding device that helps to prevent electrostatic discharge (ESD) by safely transferring static electricity from a person to the ground. It consists of a conductive strap that is worn around the wrist and a grounding wire that is connected to the ground. When a person wearing a wrist strap touches a grounded object, the static electricity on their body is transferred to the ground through the strap. This prevents the static electricity from building up and causing ESD damage to sensitive electronic equipment.
De-ionizing fans are devices that use a high-voltage discharge to create a stream of ions in the air. These ions can help to neutralize static electricity in the air, which can reduce the risk of ESD damage. However, de-ionizing fans are not as effective as wrist straps at preventing ESD damage.
Rubber gloves with matching cap are not effective at preventing ESD damage. This is because rubber is an insulator, and it does not conduct electricity. Therefore, wearing rubber gloves will not help to transfer static electricity from your body to the ground.
A static meter is a device that measures the amount of static electricity in the air. It can be used to identify areas where there is a high risk of ESD damage. However, a static meter cannot prevent ESD damage.
Therefore, the correct answer is: B. A wrist strap