Consider having multiple copies of aplusb.m file on your computer, in the following directories:

C:$/$Users$/$ahmet$/$Documents$/$MATLAB$/$aplusb$.$m

C:$/$Users$/$ahmet$/$Dropbox$/$bmes$201.$AhmetSacan.as$3344/$aplusb$.$m

C:$/$Users$/$ahmet$/$Desktop$/$aplusb$.$m

And let your Matlab PATH contain the following folders:

C:$/$Users$/$ahmet$/$Documents$/$MATLAB$/$

C:$/$Users$/$ahmet$/$Dropbox$/$bmes$201.$AhmetSacan.as$3344/$

And let your current folder be:

C:$/$Users$/$ahmet$/$Desktop$/$

When you run aplusb$()$ from the command window, which copy of the files will be executed?

C:$/$Users$/$ahmet$/$Documents$/$MATLAB$/$aplusb$.$m

C:$/$Users$/$ahmet$/$Dropbox$/$bmes$201.$AhmetSacan.as$3344/$aplusb$.$m

C:$/$Users$/$ahmet$/$Desktop$/$aplusb$.$m

QUESTION $2$

Which of the following are valid MATLAB variable names $($regardless of whether it is a recommended or discouraged name$)?$

abc$123$

abc

$abc$

body mass index

"body mass index"

body$\_$mass$\_$index

bodyMassIndex

annual$salary

height&weight

sum