Which of the following statement is not true about amorphous solids ?

Question

$\begin{array}{1 1}(a)\;\text{On heating they may crystalline at certain temperature } \\ (b)\; \text{They may become crystalline on keeping for long time } \\ (c)\;\text{Amorphous solids can be moulded by heating } \\(d)\;\text{They are ant isotropic in nature }\end{array}$