The boundaries of the solids are called curves.
$\left( a \right)$ True
$\left( b \right)$ False
$\left( c \right)$ Ambiguous
$\left( d \right)$ Data insufficient

Hint: In this particular question use the concept that boundaries of the solid are represented as surfaces and the boundaries of the surfaces are represented as curves so use these properties to reach the solution of the question.

Complete step-by-step answer:
Consider an example of a solid cube, as we all know that a cube is made up of 6 surfaces, so the boundaries of the solid are surfaces.

The names of the six surfaces is given as, ADEF, AEGB, DFHC, ADCB, EFHG, and HGBC
Now consider an example of a rectangle, as we all know that a rectangle is made up of 4 sides as these sides represent the curves, so the boundaries of the surfaces are called curves.

Hence we can say that the boundaries of the solid are represented as surfaces and the boundaries of the surfaces are represented as curves.
So this is the required answer.
Hence the given statement is false.
Hence option (b) is the correct answer.

Note: Whenever we face such types of questions the key concept we have to remember is that always recall that the solids are made up of by the combination of the surfaces such as solid cube and surfaces are made up of by the combination of curves such as, plane rectangle, plane square, plane triangle etc.