Introduction:
The question is asking how to measure the height of a skirting that is up to 30 cm. The given options are running meter, square meter, cubic meter, and kilogram. We need to determine which unit is the appropriate one to measure the height of the skirting.

Explanation:
The height of the skirting is a linear measurement, which means it is measured in one dimension only. The height is measured vertically from the base to the top of the skirting. The options provided are:

a) Running meter: This unit is used to measure linear items, such as the length of a wall, the width of a fabric, or the height of a skirting. It is the correct unit to measure the height of the skirting.

b) Square meter: This unit is used to measure the area of a two-dimensional surface. It is not appropriate for measuring the height of the skirting as it does not represent a surface area.

c) Cubic meter: This unit is used to measure the volume of a three-dimensional object. It is not appropriate for measuring the height of the skirting as it does not represent a volume.

d) Kilogram: This unit is used to measure the mass or weight of an object. It is not appropriate for measuring the height of the skirting as it does not represent a weight.

Conclusion:
In conclusion, the height of the skirting, up to 30 cm, shall be measured in running meter. This unit represents a linear measurement and is the appropriate option to measure the height of the skirting.