When a court sustains a demurrer without leave to amend, what is the burden of proving that the amendment would cure the defect?

When, as here, a court sustains a demurrer without leave to amend, "we must decide whether there is a reasonable possibility the plaintiff could cure the defect with an amendment. [Citation.] If we find that an amendment could cure the defect, we conclude that the trial court abused its discretion and we reverse; if not, no abuse of discretion has occurred. [Citation.] The plaintiff has the burden of proving that an amendment would cure the defect." (Schifando v. City of Los Angeles, supra, 31 Cal.4th at p. 1081.)