Rick, a computer consultant, owns a separate business $($not real estate$)$ in which he participates. He has one employee who works part$-$time in the business.

a$.$ If Rick participates for $95$ hours and the employee participates for $5$ hours during the year, Rick probably does not qualify as a material participant.

b$.$ If Rick participates for $550$ hours and the employee participates for $2,000$ hours during the year, Rick qualifies as a material participant.

c$.$ If Rick participates for $500$ hours and the employee participates for $620$ hours during the year, Rick qualifies as a material participant.

d$.$ If Rick participates for $120$ hours and the employee participates for $120$ hours during the year, Rick does not qualify as a material participant.