### Question:
ClientNetworkInterface extends DhcpOption { @Override protected String toStringData() { return getRevisionMajor() + "." + getRevisionMinor(); }  @Override byte getTag(); int getType(); int getRevisionMajor(); int getRevisionMinor(); @Override void validate(); static final int TAG; }### Answer:
@Test public void testToString() { ClientNetworkInterface option = new ClientNetworkInterface(); option.setData(new byte[]{1, 3, 45}); assertEquals("3.45", option.toStringData()); }