The correct answer is B because switching the secondary stream type is a stream configuration task, not an image-adjustment operation in the PTZ dome camera web interface. During image adjustment, the operator typically works with live-view and framing tools, such as directional control, local inspection, and capture assistance. That is why operations such as using a virtual joystick to move the PTZ direction, taking snapshots , and performing ePTZ for local image inspection fit naturally into image adjustment behavior.

The broader training content confirms that PTZ control belongs to live-view operation, stating that users can “perform PTZ controls … for example, control the PTZ direction, set PTZ preset positions, and set the home position” . That supports directional adjustment as a valid operation. A snapshot is also a live-view support function, while ePTZ is commonly used for image observation and local enlargement. However, secondary stream type belongs to video stream configuration, such as choosing or modifying stream properties, and is not part of direct image-adjustment handling. Therefore, the option that cannot be performed in image adjustment is B .