Will upvote. needed answer it all. thanks

The interest is compounded quarterly and periodic payment of an obligation is made every six months. If the term is one year, find the number of payment interval per interest period. * O a. 3/6 O b. 2 O c. 1/2 O d. 3 Helen deposited P3,000 at the end of every 3 months at 12% compounded monthly. If no withdrawal is made, how much is the accumulated deposit at the end of 10 years? * 0 a. 126,786.90 b. 229,123.65 C. 227,756.56 O d. 328,546.76 Find the periodic payment at the beginning of every 6 months for 3 years to discharge an obligation of P25,000 due now if money is worth 12% compounded quarterly. * O a. 4,805,78 O b.5,890.98 O c. 3,879.76 O d. 6,758.89