(a) Employers have an affirmative duty to take reasonable steps to prevent and promptly correct discriminatory and harassing conduct. (Gov. Code, § 12940(k).) (1) A determination as to whether an employer has complied with Government Code section 12940(k) includes an individualized assessment, depending upon numerous factors sometimes unique to the particular employer including, but not limited to, its workforce size, budget, and nature of its business, as well as upon the facts of a particular case