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Simplify:
(a)#(12a^5 b^3)/(4a^3 b)#

(b)#(a^(-a)×b^(-a)×c^(-a))/(a^(-2a)×b^(-2a)×c^(-2a) )#

(c)#(rs^2 t^3×r^4 s^5 t^(-6)×r^7 s^8 t^(-9))/(r^10 s^11 t^(-12)×r^13 s^(-14) t^15 )#

(d)#((16a^2 )^(1/2)×(36a^4 )^(-1/2))/(2a^(1/2)×5a^(3/2)×8a^(9/4) )#