Answer: Option 'D' is correct.
Step-by-step explanation:
Since we have given that
Upper P (Upper B vertical line Upper A)
means
[tex]P(B|A)[/tex]
It means that probability of getting event B given that Event A is occurred.
D. The probability of event B occurring, given that event A has already occurred. is also expressed as [tex]P(B|A)[/tex]
Hence, Option 'D' is correct.