A covalent bond is most likely being represented in row 1. Hence, option D is correct.
What is a covalent bond?
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.
The covalent bond is formed by the mutual sharing of valence electrons of one atom with the valence electrons of another atom. The covalent bond formed may be a single bond, a double bond or a triple bond.
If two electrons are shared between two atoms, then the single covalent bond is formed.
If four electrons are shared between two atoms, then a double bond is formed.
If six electrons are shared between two atoms, then a triple bond is formed.
Covalent network compounds are not malleable or ductile as the covalent bonds do not allow the atoms to move.
Hence, option D is correct.
Learn more about the covalent bond here:
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