21.) Which class is used to align columns at the bottom of a row?
A) .align-bottom
B) .align-items-end
C) .align-self-bottom
D) .align-row-bottom
22.) How can you make a column invisible on small screens?
A) .col-hidden-sm
B) .hide-sm
C) .d-none d-sm-block
D) .d-hide
23.) Which Bootstrap class is used for responsive column order?
A) .order-*
B) .col-order-*
C) .col-move-*
D) .grid-order-*
24.) Which class in Bootstrap ensures columns have equal height in a row?
A) .equal-height
B) .align-items-stretch
C) .row-height-auto
D) .col-height
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