The following transactions took place at Mona Ltd during 2021: Repaid long term borrowings of $32,000 Sold a long-term investment instrument for $36,000 Purchased some long-term investment instruments for $15,000 Issued $50,000 of ordinary shares and received $80,000 cash Charged depreciation of $18,000 on assets Declared and paid cash dividend of $13,000 How much is the net cash flow from investing activities? O a. $28,000 O b. $51,000 O c. $35,000 Od. $21,000