Question 1 of 30
A web developer is tasked with creating a responsive layout for a mobile application using CSS3. The application should have a header that is 100% wide, a content area that adjusts its width based on the screen size, and a footer that remains fixed at the bottom of the viewport. The developer decides to use CSS Flexbox for this layout. Which of the following CSS properties should be primarily utilized to achieve this layout effectively?
`display: flex;`
`float: left;`
`position: absolute;`
`display: grid;`

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