Which option indicates the insertion point when docking a panel into a panel group?

• A. A red vertical line
• B. A green highlight
• C. A blinking cursor
• D. A blue horizontal line

Answer: (D)

When docking a panel into a panel group, the insertion point is shown by a blue horizontal line. This line appears inside the panel group at the exact spot where the panel will be inserted, so you can place it precisely between existing panels. Release the mouse when the blue line is in your desired position to complete the dock. Other indicators aren’t used to mark the insertion point, so the blue horizontal line is the telltale cue for where the panel will go.