Shock Limited just established a simplified employee pension $($SEP$)$ plan for the benefit of its employees. The company has more than $500$ employees, $60\%$ of whom are highly compensated. This year, Shock contributed $6\%$ of each eligible employee's salary to the SEP plan. Several of the employees of the company are unfamiliar with the provisions of SEP plans and have come to you requesting information. Which of the following statements regarding the basic provisions of SEP plans are CORRECT?

Employees can roll over money that is distributed from a SEP plan into a different IRA within $60$ days without withholding or penalty as long as it is not a required minimum distribution.

Contributions must be made for any employee, age $21$ or over, who has performed services for the company in $3$ of the past $5$ years and has earned at least $$600$ during $2020.$

Employer contributions are $100\%$ vested immediately.

A SEP plan may exclude members of unions if the unions have their own retirement plan.

$1,2$ and $3$

$1,3$ and $4$

$1,2,3$ and $4$

$2,3$ and $4$