Which of these lists the qualifications for u. s. senate as described in article i of the constitution?

a.) at least 25 years old, at least seven years a u. s. citizen, and a resident of the state chosen to represent
b.) at least 25 years old, at least nine years a u. s. citizen, and a resident of the state chosen to represent
c.) at least 30 years old, at least seven years a u. s. citizen, and a resident of the state chosen to represent
d.) at least 30 years old, at least nine years a u. s. citizen, and a resident of the state chosen to represent