It is required to connect a $10$ V source with a source resistance of $1$ M$$ to a $1$ k$$ load. Find the voltage that will appear across the load if: $($a$)$ The source is connected directly to the load. $($b$)$ An inverting amplifier utilizing $100$ k$$ resistors and an ideal op amp to realize a gain of $1$ V$/$V is inserted between the source and load. $($c$)$ A unity$-$gain ideal op$-$amp buffer is inserted between the source and load. $($d$)$ Where does the load current come from in cases $($b$)$ and $($c$)?$ In each case please make sure you find the load current and the current supplied by the source.