When one of the vectors is a zero vector:

length(u+0) <= length(u) + length(0)

Add the zero matrix ( 0, 0 )^{T}
to the matrix ( 4, 3 )^{T}.
If (0, 0)^{T}
represents a displacement vector,
it means
do nothing to change position.

Now consider what this might mean:
add the vector (1, 2)^{T} to
the __point__ (4, 4)^{T}.

If you think that makes sense, then do the calculation. What type of object is the result?