What is the internal force in member $AB$ for the structure below? (by convention: positive indicates tension, negative indicates compression)

A. $-4.46$ $kN$
B. $-4.06$ $kN$
C. $-3.04$ $kN$
D. $-2.39$ $kN$
E. $2.39$ $kN$
F. $3.04$ $kN$
G. $4.06$ $kN$
H. $4.46$ $kN$