[单选]
You need to back up the existing data on a computer before you install a new application. You also need to ensure that you are able to recover individual user files that are replaced or deleted during the installation.
What should you do？（）

A . Create a System Restore point.
B . Perform an Automated System Recovery （ASR） backup and restore.
C . In the Backup and Restore Center window， click the Back up files button.
D . In the Backup and Restore Center window， click the Back up computer button.

Content networking solutions improve access to which two types of content? （） Media-rich e-learning。 Video presentations from corporate leaders。 Real-time financial system reports。 Text-based enterprise e-mail distributio。以实验研究为基础，提出了西方最早、最系统的学习理论的是（）的学习联结说。加涅。奥苏贝尔。桑代克。巴甫洛夫。斯金纳。 Layer 3 （the network layer） provides connectivity and path selection between two host systems that may be located on geographically separated networks. Which two devices operate at the network layer？（） application。 hub。 switch。 bridge。 router。表示报纸产量以及与产量有关的其他统计指标的基本单位是（）简述我国商业银行的设立分支机构的条件。

You need to back up the existing data on a computer before you install a new application. You also need to ensure that you are able to recover individual user files that are replaced or deleted during the installation.
What should you do？（）

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[单选] You need to back up the existing data on a computer before you install a new application. You also need to ensure that you are able to recover individual user files that are replaced or deleted during the installation. What should you do？（）

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[单选]
You need to back up the existing data on a computer before you install a new application. You also need to ensure that you are able to recover individual user files that are replaced or deleted during the installation.
What should you do？（）