In the systematic troubleshooting approach, which of the following statements is true about isolating an issue?
A. Asking the customer to reproduce an issue can help determine if the issue is with the device.
B. If an issue cannot be reproduced, it is likely a hardware issue.
C. Replacing an internal component will determine if the issue is related to environment.
D. Basing a conclusion on past experience with similar issues is a proven troubleshooting method.
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