Victory Bacelis is a California immigrant（移民）who grew up in a poor village in Mexico. He is used to working hard. He works more than 90 hours a week at three different jobs, including McDonal's. He is saving up to buy a house.

    One day, while Victory was cleaning the floor at McDonal's, he found an envelope and picked it up. There was $612 in it. He called the police to report the lost money. The police couldn't find the owner, so they gave the money back to Victory.

    Then Victory read a story in the newspaper about Adrian Snadoval, a baby who was very sick. Victory decided to give the money away to help pay for the baby's operation. Victory truly has a heart of gold.

函数$f\left(x\right)=\frac{4^x+1}{2^x}$的图象（   ）