The blind carbon copy (bcc) should be used when you want to

a.
share a conversation you are having with someone else with your boss

b.
give someone advice without that person realizing other people are seeing it

c.
send the same message out to a group of people but want to prevent a global reply

*write a program that defines symbolic names for several string literals (chars between quotes). * use each symbolic name in a variable definition. * use of symbolic to compose the assembly code instruction set can perform vara = (vara - varb) + (varc - vard); ensure that variable is in unsigned integer data type. * you should also further enhance your symbolic logic block to to perform expression by introducing addition substitution rule. vara = (vara+varb) - (varc+vard).