`which of the following is true ?

a) we can sometimes know the exact location and speed of an electron at the same time.

b) all orbitals in a given atom are roughly the same size.

c) since electrons have mass, we must always consider them to have particle properties and never wavelike properties.

d) atoms are roughly spherical because when all of the different shaped orbitals are overlapped, they take on a spherical shape.

e) all of the above are true.