Which of the following statements is $($are$)$ true?

$1.$ A SEP requires the plan sponsor to provide at least a $100\%$ match up to $3\%$ of all employee deferrals.

$2.$ A SEP plan can be established by employers who employ more than $100$ employees who earn $$5,000$ or more during the preceding calendar year.

$3.$ SIMPLEs can be either contributory or noncontributory plans, whereas newly established SEP plans are always noncontributory.

$4.$ An employer who wants to share the responsibility of retirement plan funding should establish a SIMPLE rather than a SEP.