In a common emitter configuration with suitable bias, it is given that `R_(L)` is theload resistance and `R_(BE)` is small signal dynamic resistance (iiput side). Then, volage gain, current gain and power gain are given , respectively, by :
`beta` is currentgain , `I_(B), I_(C)` and `I_(E)` are respectively base, collector and emitter currents.

Options

A. `beta(R_(L))/(R_(RE)),(triangleI_(C ))/(triangleI_(B)),beta^(2)(R_(L))/(R_(BE))`
B. `beta(R_(L))/(R_(RE)),(trinangleI_(E ))/(triangleI_(B)),beta^(2)(R_(L))/(R_(RE))`
C. `beta^(2)(R_(L))/(R_(RE)),(trinangleI_(c ))/(triangleI_(B)),beta(R_(L))/(R_(RE))`
D. `beta^(2)(R_(L))/(R_(RE)),(trinangleI_(E ))/(triangleI_(C)),beta^(2)(R_(L))/(R_(RE))`

Explanation

Current gain in common emitter configuration is defined the ratio of charge in collector current to the change in base current
Voltage gain A
Power gain AP= voltage gain `xx` current gain
`betaA = beta^(2) (R_(L))/( R_(BE))`
Oution (a) is current.