Three unequal positive numbers \(a, b, c\) are such that \(a, b, c\) are in G.P. while \(\log \left(\frac{5 c}{2 a}\right), \log \left(\frac{7 b}{5 c}\right), \log \left(\frac{2 a}{7 b}\right)\) are in A.P.
Then \(\mathrm{a}, \mathrm{b}, \mathrm{c}\) are the lengths of the sides of
(A) an isosceles triangle
(B) an equilateral triangle
(C) a scalene triangle
(D) a right-angled triangle