Keeping c subscript 2 constant at c subscript 2 =4 , the interval for c subscript 1 in which the current optimal solution remains optimal is

a. 24 over 7 less or equal than negative c subscript 2 less or equal than 6
b. negative 24 over 7 less or equal than c subscript 1 less or equal than 6
c. negative 6 less or equal than c subscript 1 less or equal than negative 24 over 7
d. 24 over 7 less or equal than c subscript 1 less or equal than 6
e. none of the above

Why is it easier for new entrants to get involved in radical innovations when compared to incumbent firms? a. unlike incumbent firms, new entrants do not have to face the high entry barriers, initially. b. new entrants are embedded in an innovation ecosystem, while incumbent firms are not. c. unlike incumbent firms, new entrants do not have formal organizational structures and processes. d. incumbent firms do not have the advantages of network effects that new entrants have.