Answer:
The client should open up a 529 Education Savings Plan.
Explanation:
Each of the plans listed will either have tax consequences or does not meet the desired criteria other than the 529 Plan. UGMA accounts transfer directly to the minor when the child reaches the age of majority. Mutual funds will be subject to taxation on an annual basis. The Coverdell programs only allow $2,000 of contributions per year. So the 529 is the best plan for this client's children