Which one is an example of an amorphous solid?

Solid $NaCl$ is a bad conductor of electricity since:

Pure silicon doped with phosphorus is

Which of the following exhibits the highest melting point?

Amorphous substances show:

For amorphous solids,select the correct option using $T$ (True) or $F$ (False) for the following statements:
$(1)$ They soften over a range of temperature.
$(2)$ Their physical properties like electrical conductivity and thermal conductivity are the same in all directions.
$(3)$ The arrangement of their particles is disordered.
$(4)$ They are hard and are less affected by pressure.