What is the cause of lipoedema?

Lipoedema is caused by abnormal fat deposits in the subcutaneous tissue.
Lipoedema is caused by a decrease in pressure inside the tissue, leading to free fluid filtration into interstitial spaces.
Lipoedema is caused by a malfunction in the lymphatic system.
a) Only statement I is correct.
b) Only statement II is correct.
c) Only statement III is correct.
d) Statements I and III are correct.
e) Statements II and III are correct.