A very long uniformly charged cylinder (radius R) has a surface charge density `sigma` . A very long uniformaly charged line charge( linear charge density `lambda`) is placed along the ctlinder axis. If electric field intensity vector outside the cylinder is zerom then :
A. `lambda=Rsigma`
B. `lambda=-Rsigma`
C. `lambda=2piRsigma`
D. `lambda=-2piRsigma`