Technician A says that the block deck is the surface to which the cylinder head attaches and can be curved. Technician B says that core plugs are used to fill the holes in the block used for casting. Which technician is correct?

A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B

Three-phase, 4-wire panelboards are usually constructed with an even number ofspaces available for each phase; thus, the total number of spaces would be in incre-ments of 6, such as 12, 18, 24, 30, 36, or 42. how many spaces would be available forthe later addition of circuit breakers in panelboard p-1 after the panelboard has been equipped as scheduled?