Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to change scrolling speed on a mac [title] Click the apple menu. [step] This is in the upper-left corner of the screen. [title] Click " system preferences.

Ending1: " [title] Click " system preferences " on the left pane. [title] Click " customize my scrolling speed. Ending2: " [title] Click or click " notifications. " [step] This is on the right side of the screen. Ending3: " [step] If the main system preferences menu doesn't appear, click the " show all " button at the top of the window. This button looks like a grid of 12 dots. Ending4: " [title] Click the " internet " tab. [step] It's to the right of the " system preferences " option in the drop-down menu.

Answer format: ending1/ending2/ending3/ending4