For these questions, the following functions have been defined:
$la(x,y,z) = min(x+y, y+z)$
$le (x,y,z) = max(x–y, y–z)$
$ma(x,y,z)=(1/2) [le(x,y,z)+la(x,y,z)]$
For $x = 15, y = 10$ and $z = 9$, find the value of: $le (x, \min(y, x–z), le(9, 8, ma(x,y,z))$.
- $5$
- $12$
- $9$
- $4$