Mai Ly's bag contains red and blue beads. The number of red beads in the bag (7) is at least the number of blue beads in the bag (b). There are at most 400 beads in the bag. Which system of inequalities could be used to determine the number of red beads in Mai Ly's bag?
O A r2 26
r+b< 400
T>O
b>0
O B. g < 26
T+b> 400
t> 0
b>0
o c. p > 2 (+ +6)
+b< 400
t> 0
b>0
OD.7<}(r+b)
th>400