Consider the cross-section of a beam made up of thin uniform elements having thickness $t\left (t < < a \right )$ shown in the figure. The $(x, y)$ coordinates of the points along the center-line of the cross-section are given in the figure.

The coordinates of the shear center of this cross-section are:

1. $x = 0, y = 3a$
2. $x = 2a, y = 2a$
3. $x = -a, y = 2a$
4. $x = -2a, y = a$