In order to strengthen the scientific research cooperation with the cooperative units, dawning Research Institute needs to send hard-working scientific and technological personnel to the cooperative units to carry out their work. According to the job requirements, the leaders of the institute decided that: (1) at least one of An and B should be sent; (2) at most one of B and C should be sent; (3) if D is sent, both C and E should be sent; (4) at least 3 of A, B, C, D and E should be sent.
, who can be launched will definitely be sent?
B