CSS Quiz

Which of the following will create a triangle effect using pure CSS3 on a white background, without making use of background images?
It is not possible to do so.
Border-color: #a0c7ff #ffffff #ffffff #ffffff; border-style: solid; border-width: 20px; width: 0px; height: 0px;
Background-color: #a0c7ff #ffffff #ffffff #ffffff; border-style: solid; border-width: 20px; width: 0px; height: 0px;
Background-color: #a0c7ff #ffffff #ffffff #ffffff; border-style: solid; border-width: 1px; width: 10px; height: 10px;
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