Can you help me answer the questions below? Please do not copy previous answers and explain in detail. Thanks a lot. Please read the questions and the image carefully.

$0.$ At t$=3,$ what is the source entry for switch $1?$ N$.$B: Format your answer as $($letter$,$ number$)$ or n$/$a

$1.$ At t$=3,$ what is the destination entry for switch $1?$ N$.$B: Format your answer as $($letter$,$ number$)$ or n$/$a

$2.$ At t$=3,$ what is the source entry for switch $2?$ N$.$B: Format your answer as $($letter$,$ number$)$ or n$/$a

$3.$ At t$=3,$ what is the destination entry for switch $2?$ N$.$B: Format your answer as $($letter$,$ number$)$ or n$/$a

$4.$ At t$=4,$ what is the source entry for switch $1?$ N$.$B: Format your answer as $($letter$,$ number$)$ or n$/$a

$5.$ At t$=4,$ what is the destination entry for switch $1?$ N$.$B: Format your answer as $($letter$,$ number$)$ or n$/$a

$6.$ At t$=4,$ what is the source entry for the switch $2?$ N$.$B: Format your answer as $($letter$,$ number$)$ or n$/$a

$7.$ At t$=4,$ what is the destination entry for switch $2?$ N$.$B: Format your answer as $($letter$,$ number$)$ or n$/$a