Two liquids A and B have ${\theta _A}$ and ${\theta _B}$ as contact angles in a capillary tube. If $K = \cos {\theta _A}/\cos {\theta _B}$, then identify the correct statement:
Select the correct option:
A
K is negative, then liquid A and liquid B have concave meniscus
B
K is zero, then liquid A has convex meniscus and liquid B has concave meniscus
C
K is negative, then liquid A and liquid B have convex meniscus
D
K is negative, then liquid A has concave meniscus and liquid B has convex meniscus
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