None of the above.
He wasn't likely lying as he was under oath, and his very competent lawyers would've advised him strongly against perjury.
He's obviously neither incompetent nor inept. He successfully navigated a Congressional sideshow and delivered the expectation that shareholders had, much to the chagrin of end users.
The only ones lying, incompetent and inept are us - those who continue to use Facebook fully knowing next to nothing has changed from the hearing. If you haven't already deleted Facebook, think hard