A 43 year old female patient complains of dull ache around both ankles after a days' work as a cahier. This symptoms relieve by sitting and elevating...

A 43 year old female patient complains of dull ache around both ankles after a days' work as a cahier. This symptoms relieve by sitting and elevating her legs. Patient reports ankle edema at the end of the day. What is the most likely cause for this problems?

Varicose veins

Deep vein Thrombosis

High sodium diet

Congestive heart failure