which pseudocode for the binary tree method isLeaf() returns true if the node is a leaf and false if not.

a.

return ( leftChild > rightChild) AND ( rightChild < leftChild)

b. return ( leftChild == null) OR ( rightChild == null)

c.

return ( leftChild > rightChild ) OR ( rightChild < leftChild )

d.

return ( leftChild == null) AND ( rightChild == null)