The compliance officer should recommend an audit for cash transactions since the last compliance review, as this would help to identify the extent of the problem, the root causes, and the potential risks involved. The audit would also provide evidence for corrective actions and remedial measures to prevent future occurrences of non-compliance. The compliance officer should not recommend terminating or suspending the teller's employment, as this would be premature and disproportionate without a thorough investigation and due process. The compliance officer should not recommend formally reprimanding the branch manager, as this would not address the underlying issues and could create a hostile work environment.
ACAMS CAMS Certification Study Guide, 6th Edition, Chapter 5, page 1251 ACAMS CAMS Certification Video Training Course, Module 5, Lesson 12 ACAMS CAMS Certification Exam Outline, Domain 5, Task 33

New business products should be evaluated for AML concerns before they are launched into the market. This is because new products may introduce new risks or vulnerabilities that could be exploited by money launderers or terrorist financiers. By conducting a pre-launch assessment, a financial institution can identify and mitigate these risks, design appropriate controls and procedures, and ensure compliance with the relevant laws and regulations. A pre-launch assessment can also help a financial institutionto align its AML strategy with its business objectives, and avoid potential reputational damage or regulatory sanctions.
9 Things to Consider When Evaluating an AML Solution
CAMS Study Guide 6th Edition, page 38.

The board of directors has the ultimate responsibility within a bank for ensuring that the bank has a comprehensive and effective BSA/AML program and oversight framework that is reasonably designed to ensure compliance with applicable regulations. According to the Federal Financial Institutions Examination Council (FFIEC) BSA/AML Examination Manual, the board of directors must approve the BSA/AML compliance program, which includes the BSA/AML policy, internal controls, independent testing, designatedBSA/AML compliance officer, and training1. The board of directors must also provide sufficient resources, ensure qualified staff, and hold senior management accountable for implementing and adhering to the BSA/AML compliance program1.
1: FFIEC BSA/AML Examination Manual, Board of Directors and Senior Management Oversight

The most suspicious transaction indicators related to casino activities are:
* A client requests a winnings check (cheque) in a third party's name. This could indicate an attempt to conceal the source or ownership of the funds, or to evade reporting requirements.
* Acquaintances bet against each other in even-money games and it appears they are intentionally losing to one of the parties. This could indicate a scheme to launder money through the casino by transferring funds from one party to another without attracting attention.
* A client requests the transfer of winnings to the bank account of a third party in a country without an effective anti-money laundering regime. This could indicate an attempt to move funds to a high-risk jurisdiction or to a person or entity that is involved in illicit activities.
The option that is not suspicious is:
* A new client who is a large volume player asks the casino operator about the ability to transfer the funds to other locations in the same country. This could be a legitimate inquiry from a high-net-worth individual who travels frequently and wants to access their funds conveniently.
ACAMS CAMS Certification Video Training Course - Exam-Labs1
Exam CAMS: Certified Anti-Money Laundering Specialist (the 6th edition)2 ACAMS Study Guide for the Certification Examination, 6th Edition, Chapter 8, page 173
https://www.acams.org/wp-content/uploads/2019/08/ACAMS-Study-Guide-6th-Edition-Chapter-8.pdf

According to the FATF Recommendation 10, financial institutions should conduct ongoing due diligence on the business relationship and scrutiny of transactions undertaken throughout the course of that relationship to ensure that the transactions being conducted are consistent with the institution's knowledge of the customer, their business and risk profile, including, where necessary, the source of funds. This is one of the core measures of customer due diligence (CDD) that aim to prevent and detect money laundering and terrorist financing risks.
= The main reference for this question is the document titled "International Standards on Combating Money Laundering and the Financing of Terrorism & Proliferation - The FATF Recommendations" published by the FATF in February 2018. You can access it by clicking here. You can also find more information about the CDD measures and the risk-based approach on the FATF website, the CFATF website, the Central Bank of Ireland website, and the Medium blog.