True or false?

a. All elements of an array are of the same type.
b. Arrays cannot contain strings as elements.
c. Two-dimensional arrays always have the same number of rows and columns.
d. Elements of different columns in a two-dimensional array can have different types.
e. A method cannot return a two-dimensional array.
f. A method cannot change the length of an array argument.
g. A method cannot change the number of columns of an argument that is a two-dimensional array.