You're tasked with creating a Bootstrap alert that fades out and slides up when dismissed. Describe the combination of classes and transitions needed.

fade, slide-up, alert-dismissible, fade-out
alert, fade-out, dismissible, fade-up
alert, fade, slide-out, dismissible
fade, alert-dismissible, fade-up, slide-out

To achieve a fading-out and sliding-up effect for a Bootstrap alert, you need to apply the classes 'fade' and 'slide-up,' and utilize the 'alert-dismissible' class for dismissal. The correct combination ensures a smooth transition when the alert is closed.

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