Let g be a differentiable function such that g(3)=2 and g′(3)=−34. The graph of g is concave down on the interval (2,4). Which of the following is true about the approximation for g(2.6) found using the line tangent to the graph of g at x=3? A: g(2.6)≈1.7 and this approximation is an overestimate of the value of g(2.6).

B: g(2.6)≈1.7 and this approximation is an underestimate of the value of g(2.6).

C: g(2.6)≈2.3 and this approximation is an overestimate of the value of g(2.6).

D: g(2.6)≈2.3 and this approximation is an underestimate of the value of g(2.6).