According to Valence bond theory, which of the following is considered as zero overlap(Z-axis is the inter nuclear axis)

Since ‘Z’ axis is the inter nuclear axis.The possible overlaps (negative (or) positive) are 1)s-s, s-pz,pz-pz,py-py  and px-px ; Zero overlaps; 2)s-px,s-py, px-py, px-pz, py-pz   ;