ANSWER: Both a and b
Explanation:
Indian Agricultural Research Institute has released 7 varieties of field crops including pigeon pea, mustard, rice, wheat and chickpea along with 11 varieties of HYV agricultural and horticultural produce during 2015. These varieties are resilient to biotic and abiotic stresses and have enhanced nutritional quality. The flagship institute of ICAR, IARI has announced the release of these varieties during its 54th convocation. Varieties include newly developed pigeon pea/arhar dal and mustard.