Exam Certified Platform Developer II topic 1 question 9 discussion

C https://developer.salesforce.com/docs/component-library/bundle/lightning:layoutItem/example#lightningcomponentdemo:exampleLayoutItemsSizeOverrides

Answer is A. The lightning:layoutItem components are assigned sizes based on device sizes (medium and large) to control the layout behavior on different screen sizes. In option A, the sizes are set to "6" for mediumDeviceSize, indicating that each layout item should take up half the width on medium devices (like tablets) and "4" for largeDeviceSize, indicating that each layout item should take up one-third of the width on large devices (like desktops). This configuration allows the information to display correctly on desktops and tablets in a single row, with each item taking up the appropriate width based on the screen size.

C is the correct

Each component will take up all 12/12 columns of a row on small devices, but for medium and larger devices each component will take up 4/12 columns of the row and hence all 3 components will appear in one row

https://developer.salesforce.com/docs/component-library/bundle/lightning:layoutItem/documentation - If you specify the size and smallDeviceSize attributes, the size attribute applies to small mobile phones, and the smallDeviceSize applies to smart phones. The sizing attributes are additive and apply to devices of the specified size and larger. For example, if you set mediumDeviceSize=10 and don't set largeDeviceSize, then mediumDeviceSize applies to tablets, desktops, and larger devices. You'd also have to set size to apply to devices smaller than tablets. c is correct

C is correct 3 rows => 12/3 = size 4

C is corret

The correct ans is C https://salesforce.stackexchange.com/questions/305647/responsive-layouts-in-lwc