WhichofthefollowingformulasaccuratelyexpressesStarlinglawofcapillaryfiltration

WhichofthefollowingformulasaccuratelyexpressesStarlinglawofcapillaryfiltration A. Q=kA[(Pc-Pi)+σ(πi-πc)] B. Q=kA[(Pc-Pi)+k(πi-πc)] C. Q=kA[(Pc-Pi)-σ(πi-πc)] D. Q=kA[(Pc-Pi)-k(πi-πc)]