為了瞭解過去 30 天使用者來自哪些類型的裝置 (如電腦或手機)，你製作了一份報表。在這份報表中，以下何者算是 Google Analytics 的「指標」？

手機的使用者人數" (Number of mobile users) is a metric because it is a quantitative measurement, representing a count of users. Metrics are numerical values that quantify data. "使用者進入網站的管道" (Channel users entered the website) is a dimension, as it describes the source of traffic. "過去 30 天的資料範圍設定" (30-day data range setting) is a filter or date range, not a metric or dimension itself. "裝置類型：電腦和手機" (Device type: computer and mobile) describes categories of devices, making it a dimension.