Over a period of 20 years, the number of swimming pools f overtaken by labradoodles in North Carolina can be modeled by f(x)=−0.03x^4+0.60x^3−2.50x^2+9.00x−1.90, where x is the time (in years). In which year did the number of overtaken swimming pools surpass 50 for the first time?a.Year 10b.Year 16c.Year 15d.Year 1e.Year 5