Select the following valid char value$($s$).$

a

$\text{'}-7\text{'}$

$1$

$\text{'}10\text{'}$

$\text{'}1\text{'}$

$\text{'}8\text{'}$

$\text{'}$r$\text{'}$

$"$E$"$

$\text{'}$B$\text{'}$

$\text{'}$$$\text{'}$

$\text{'}+\text{'}$

$"$A$"$