The following economic model predicts whether a voter will vote for an incumbent school board member. INCUMBENT = [30 + [31 MALE + BzPARTY + B3MARR|ED + B4K|DS + u Where INCUMBENT = 1 if the voter votes for them, 0 othen/vise, MALE = 1 if the voter is a male, PARTY =bindicates the voter is registered with the same political party as the incumbent, MARRIED = 1 for married voters, 0 othen/vise, and KIDS = is the number of school age kids living in the voter's house. If you hypothesize males and females might have a different willingness to vote for a candidate registered with a different political party, which variable should you add to the economic model to allow you to test the hypothesis? 0 3- MALE * MARRIED O b. MARRIED * PARTY O C- MALE * KIDS 0 d- MALE * PARTY