You are given the following assembly program, with additional information about the program memory address of each instruction.

Line no$.$ Prog. address $($hex$)$ Label Instruction

$11$D$24$

ldi R$17,-10$

$21$D$25$ ldi R$20,23$

$31$D$26$ call CALC

$41$D$28$ rjmp end

$51$D$29$ SUBT: subi R$20,15$

$61$D$2$A ret

$71$D$2$B CALC: add R$20,$ R$17$

$81$D$2$C call SUBT

$91$D$2$E ret

$101$D$2$F end: rjmp end

What is the value of R$20$ when the program just completes line $7?$ Select all correct representations.

Group of answer choices

$13$

$254$

$-2$

$23$

$8$