Options: a. Do not enter a value in the foreign key field of a child table if that value does not exist in the primary key of the parent table
b. Do not enter a value in the primary key field of chield table if that value does not exist in the primary key of the parent table
c. Do not enter a value in the foreign key field of a parent table if that value does not exist in the primary key of the child table
d. All of above
Options: a . a 16-bit register in the microprocessor that indicate the beginning of the stack memory. b . a register that decodes and executes 16-bit arithmetic expression. c. The first memory location where a subroutine address is stored. d . a register in which flag bits are stored
Options: that would be attracted to the earths north magnetic pole, that has its molecules arranged in a random pattern, that would be attracted to the earth's south magnetic pole, that would be repelled by the north pole of another magnet
When two computers communicate with each other, they send information back and forth. If they are separated by a reasonable distance, they can send and receive the information through a direct cable connection which is called a null-modem connection. Presently what is the maximum distance in metres permitted in this null-modem connection?