Final answer:
The standard of care for corporate trustees is to maintain a fiduciary standard at all times, which involves acting in the best interest of beneficiaries, managing assets responsibly, and applying their expertise for the beneficiaries' advantage.
Step-by-step explanation:
The standard of care for corporate trustees is d. A fiduciary standard at all times. This means they are expected to act in the best interests of the beneficiaries and with a high degree of loyalty, prudence, and care. As described in the information provided, a person of wealth, analogous to a trustee, is seen as an agent and a trustee for those less fortunate and hence must adopt a similar approach to managing the trust. This involves shunning extravagance, meeting the legitimate needs of those dependent, and responsibly managing surplus revenues as trust funds, applying their wisdom and experience to administer the trust in a way that renders the most beneficial results for the beneficiaries.