Question $1$

To open a file c:$\backslash$scores$.$txt for reading, use

infile $=$ open$($file $="$ci$\backslash$scores$.$txt$","$r$")$

infile $=$ open $("$c:$\backslash$scores$,*$ xxt$","$r$")$

infile file $="$c:$\backslash$scores$.$txt$"."$r$")$

infile $=$ open$("$c:M$\backslash$scores$.$txt$","$r$")$