The pervasive phenomenon of women being blocked in career advancement by invisible barriers has been called the

A) top-down barrier.
B) occupational advancement bias.
C) glass ceiling.
D) old-boy network.

While finger painting,Imran mixed yellow paint and blue paint and ended up with green.Which mixing method did Imran use

A)  subtractive colour mixing 
B)  trichromatic mixing 
C)  additive colour mixing 
D)  multiplicative colour mixing