An $\text{npn}$ transistor has a beta cut-off frequency $f \beta$ of $1 \; \mathrm{MHz}$, and common emitter short circuit low frequency current gain $\beta \mathrm{O}$ of $200$. It unity gain frequency $f \mathrm{T}$ and the alpha cut-off frequency $f \alpha$ respectively are
- $200 \; \mathrm{MHz}, 201 \; \mathrm{MHz}$
- $200 \; \mathrm{MHz}, 199 \; \mathrm{MHz}$
- $199 \;\mathrm{MHz}, 200 \; \mathrm{MHz}$
- $201 \; \mathrm{MHz}, 200 \; \mathrm{MHz}$