A vector is a physical quantity which has:

Vector

• A vector is a physical quantity that has Magnitude and direction.
• Symbols for physical quantities that are vectors are in bold type, underlined or with an arrow above.
• It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the quantity’s magnitude.
• For example, displacement, velocity, and acceleration are vector quantities.
• A quantity that requires both the magnitude in number field along with the direction of the quantity accompanied by the units of measurement or SI units is known as a vector quantity.
• Vector quantities should also obey the triangular law of vectors.
• Hence, Option 4 is correct.
• Scalars: A scalar is a physical quantity that has magnitude but no direction.