The output from NAND gate having inputs A and B given below will be,

For the following circuit and given inputs A and B, choose the correct option for output '$$Y$$'

In an n-p-n common emitter (CE) transistor the collector current changes from 5 $$\mathrm{mA}$$ to $$16 \mathrm{~mA}$$ for the change in base current from $$100~ \mu \mathrm{A}$$ and $$200 ~\mu \mathrm{A}$$, respectively. The current gain of transistor is __________.