Quiz: String interpolation

Select the strings, where the value of $x is interpolated exactly one time.

1	"The temperature is $x degrees"
0	'Air pressure is $x mmHg'	No interpolation in single quotes.
0	'The value of \\$x is $x'	No interpolation and no escaping. It prints `The value of \$x is $x`.
1	"The value of \\$x is $x"	The whole phrase gives, for example, `The value of $x is 42`.
0	"The value of $x is $x"	`$x` is interpolated twice here.

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