A TCSP providing services should have policies and procedures in place to identify critical information of the signatory, as this is one of the key elements of the customer due diligence (CDD) process. The signatory is the person who has the authority to sign documents or contracts on behalf of the customer, such as a company, a trust, or a partnership. The signatory may also be the beneficial owner, the controller, or a nominee of the customer. The TCSP should verify the identity and the capacity of the signatory, as well as the source and origin of the funds or assets involved in the transaction or business relationship. The TCSP should also monitor the activities of the signatory and report any suspicious or unusual transactions or changes in the signatory's behaviour or profile.
References:
ACAMS Study Guide for the CAMS Certification Examination - 6th Edition, Chapter 2: Compliance Standards for Anti-Money Laundering (AML) and Combating the Financing of Terrorism (CFT), Section 2.2: Customer Due Diligence (CDD), Subsection 2.2.1: CDD Process, pp. 51-52 RISK-BASED APPROACH GUIDANCE FOR TRUST AND COMPANY SERVICE PROVIDERS (TCSPs), Section III - Guidance for TCSPs, Subsection III.1: Risk Assessment, pp. 23-24 SRA | Trust and Company Service Provider guidance | Solicitors Regulation Authority, Section:
Definition, Paragraph 2
A Trust and Company Service Provider (TCSP) providing services should have policies and procedures in place to identify critical information of the:, Answer B

According to the ACAMS study guide, one of the best practices for dealing with law enforcement inquiries is to verify the identity and authority of the law enforcement officer before providing any information (p. 224).
This is to ensure that the inquiry is legitimate and not a phishing attempt or a breach of confidentiality. The compliance officer should also document the inquiry and the information provided, and consult with legal counsel if necessary. The other options are not appropriate, as they may either violate the law, compromise the investigation, or create unnecessary work.
References:
ACAMS. (2020). Study Guide for the Certification Examination for Anti-Money Laundering Specialists (6th ed.). Miami, FL: ACAMS.
What Is An AML Officer1

Explanation/Reference: http://www.qfcra.com/en-us/whatwedo/AntiMoneyLaundering/Documents/Guidance%20on%
20Correspondent%20Banking%20May%202018.pdf (7)