A trasmission line with a characteristic impedance of $100\:\Omega$ is used to match a $50\:\Omega$ section to a $200\:\Omega$ section. If the matching is to be done both at $429\:MHz$ and $1\:GHz$, the length of the transmission line can be approximately
- $82.5\:cm$
- $1.05\:m$
- $1.58\:m$
- $1.75\:m$