A user notices that a mobile device is draining power faster than is normal. What are three causes of quick battery drain? (Choose three.) a. An app is not compatible with the device. b. The device is roaming between call towers. c. The device is connecting over a VPN. d. An app is using too many resources. e. The display is set to a high level of brightness. f. The airplane mode is turned on. g. Navigation Bar.