Which sentence uses correct capitalization?
a.Harriet and her Father, who happens to be our principal, are going to Mt. Rushmore next weekend.
b.Harriet and her father, who happens to be our principal, are going to Mt. Rushmore next weekend.
c.Harriet and her father, who happens to be our Principal, are going to mt. Rushmore next weekend.
d.Harriet and her father, who happens to be our Principal, are going to Mt. Rushmore next weekend.