According to IIA guidance, which of the following is required of an internal audit activity?

The internal audit activity should refrain from conducting an assurance engagement for which it lacks the necessary competencies or skills

The chief audit executive must decline a consulting engagement or obtain competent advice and assistance if internal auditors lack the necessary competencies or skills

The audit committee should ensure that the internal audit activity continuously improves its knowledge and skills in order to fulfill its responsibilities

In today's business climate which is dominated by technology and big data, it is imperative that each staff internal auditor has detailed knowledge about IT risks and technology-based audit techniques