A person to whom the overarching obligations apply must not make any claim or make a response to any claim in a civil proceeding that—
(a) is frivolous; or
(b) is vexatious; or
(c) is an abuse of process; or
(d) does not, on the factual and legal material available to the person at the time of making the claim or responding to the claim, as the case requires, have a proper basis.