What is the test for ineffective assistance of counsel?

"An appellant claiming ineffective assistance of counsel has the burden to show: (1) counsel's performance was deficient, falling below an objective standard of reasonableness under prevailing professional norms; and (2) the deficient performance resulted in prejudice." (People v. Montoya (2007) 149 Cal.App.4th 1139, 1146-1147

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(Montoya); Strickland v. Washington (1984) 466 U.S. 668, 687 [80 L.Ed.2d 674, 693].) "In determining whether counsel's performance was deficient, we exercise deferential scrutiny. [Citations.] The appellant must affirmatively show counsel's deficiency involved a crucial issue and cannot be explained on the basis of any knowledgeable choice of tactics." (Montoya, at p. 1147.) " ' " 'Reviewing courts defer to counsel's reasonable tactical decisions in examining a claim of ineffective assistance of counsel [citation], and there is a "strong presumption that counsel's conduct falls within the wide range of professional assistance." ' " ' " (Ibid.) " 'Competent counsel is not required to make all conceivable motions or to leave an exhaustive paper trail for the sake of the record. Rather, competent counsel should realistically examine the case, the evidence, and the issues, and pursue those avenues of defense that, to their best and reasonable professional judgment, seem appropriate under the circumstances.' " (Id. at pp. 1147-1148.)