Choose the correct steps to insert an item into a B$-$tree.

Group of answer choices

Find an appropriate leaf node. Insert the item into the leaf if there is room. If the leaf is full, split the node into two nodes and the median element is moved to the parent node.

Find an appropriate leaf node. Insert the item into the leaf if there is room. If the leaf is full, split the node into two nodes and the first element is moved to the parent node.

A new item can be inserted in any leaf nodes.

Find an appropriate leaf node. Insert the item into the leaf. if the leaf is full, exapand the leaf node.