The content of the registers are $R_{1} = 25H, R_{2} = 30H$ and $R_{3} = 40H$. The following machine instructions are executed.
$\text{PUSH } \{R_{1}\}$
$\text{PUSH } \{R_{2}\}$
$\text{PUSH } \{R_{3}\}$
$\text{POP } \{R_{1}\}$
$\text{POP } \{R_{2}\}$
$\text{POP } \{R_{3}\}$
After execution, the content of registers $R_{1},\:R_{2},\:R_{3}$ are
- $R_{1}=40H,\:R_{2}=30H,\:R_{3}=25H$
- $R_{1}=25H,\:R_{2}=30H,\:R_{3}=40H$
- $R_{1}=30H,\:R_{2}=40H,\:R_{3}=25H$
- $R_{1}=40H,\:R_{2}=25H,\:R_{3}=30H$