Four single individuals Donald $,$ Bernie, Kamala and Warren come into your office seeking your sage advice and financial wisdom $.$

Donald, age $63$ has no job and is living off his substantial stock and bond portfolio which gives him $$50,000$ of annual interest and dividend income.

Berni, age $68$ works as a CPA and has a salary of $$250,000$ with no retirement plan

Kamala, age $35$ is an attorney with a salary of $$50,000$ with a $401($k$)$ Defined Contribution Plan.

Warren, age $45$ is a CEO making $$250,000$ and a Defined Benefit pension plan.

a$)$ Which of these four can make a maximum contribution to a Traditional IRA? How much is that contribution for each?

b$)$ Which of these four can get a full tax deduction for their traditional IRA contribution?

c$)$ Which of these four can make a maximum contribution to a Roth IRA?

d$)$ Which of these four can get a full tax deduction for their Roth IRA contribution??