The short sides of a rectangle are 2 inches. The long sides of the same rectangle are three less than an unknown number of inches.

Two students are told that the perimeter of this rectangle is at least 30 inches. The first student says, "The length of the long side must be at least 13 inches". The second student says, "The unknown number must be at least 10 inches". Which of the following statements is true?
a. The first student is correct.
b. Both students are correct.
c. Neither student is correct.
d. The second student is correct.