What is the standard for ineffective assistance of counsel?

To demonstrate ineffective assistance of counsel, " '[Defendant] must show that trial counsel failed to act in a manner to be expected of reasonably competent attorneys acting as diligent advocates. In addition, [he] must establish that counsel's acts or omissions resulted in withdrawal of a potentially meritorious defense...' [ [or] ] counsel failed to perform with reasonable competence and that it is reasonably probable a determination more favorable to the defendant would have resulted in the absence of counsel's failings. [ [Citations] ]." ¹¹ (People v. Fosselman (1983) 33 Cal.3d 572, 581-584, 189 Cal.Rptr. 855, 659 P.2d 1144.) With this standard in mind, we consider each claimed inadequacy in the order presented.