What is the burden of proving deficient counsel in a motion?

of counsel, a defendant must show that his or her counsel's performance was deficient and that the defendant suffered prejudice as a result of such deficient performance. [Citation.] To demonstrate deficient performance, defendant bears the burden of showing that counsel's performance '"'"fell below an objective standard of reasonableness ... under prevailing professional norms."'"' [Citation.] To demonstrate prejudice, defendant bears the burden of showing a reasonable probability that, but for counsel's deficient performance, the outcome of the proceeding would have been different." (People v. Mickel (2016) 2 Cal.5th 181, 198.)