struct rectangleDataIn C$++,$ the scope resolution operator is $\_\_\_\_.$

a$.$

:

b$.$

$

c$.$

::

d$.$

$.$

$\{$

$$double length;

$$double width;

$$double area;

$$double perimeter;

$\}$;

Which of the following variable declarations is correct?

a$.$

struct rectangleData$()$;

b$.$

rectangleData rectangle.length;

c$.$

rectangle rectangleData;

d$.$

rectangleData myRectangle;