A random sample of 121 observations produced a sample proportion of 0.35. An approximate 95% confidence interval for the population proportionpis between

a) 0.265 and 0.421

b)0.307 and 0.393

c)0.265 and 0.435

d)0.245 and 0.455

e)0.279 and 0.421

f)None of the above.