Answers for "which of the following property will display border with rounded corners"

css rounded corners

/* Set rounded corners with border-radius property */

.class {
  border-radius: 4px;
}

.circle {
  border-radius: 50%;
}

css rounded corners at top only

border-radius: 10px     10px      0           0;
            // top-left top-right bottom-right bottom-left.