单选题 On November 15, 2008, Grinell Construction Company decided to issue bonds to help finance the acquisition of new construction equipment. They issued bonds totaling $10000000 with a 6% coupon rate due June 15, 2028. Grinell has agreed to pay the entire amount borrowed in one lump sum payment at the maturity date. Grinell is not required to make any principal payments prior to maturity. What type of bond structure has Grinell issued?

• A. Serial bonds.
• B. Bullet maturity.
• C. Redeemable bonds.