Row Matrix always on the Left

When a row matrix is multiplied by a rectangular matrix, the row matrix must be on the left.

Look at the dimensions of the operands and of the result:

Row Matrix  x  Matrix   =   Result Row Matrix

  1 x M        M x C           1 x C

A 1xC matrix is a row matrix of "C" number of columns. For each row in the following table, decide if the product can be formed and what the dimensions of the result will be.