JW Enterprises is condsidering a new marketing cammpaign that will require the addition of a new computer programmer and new software. The programmer will occupy an office in JW's current building and will be paid $8,000 per month. The software license costs $1,000 per month. The rent for the building is $4,000 per month. JW's computer system is always on, so running the new software will not change the current monthly electric bill of $900. The incremental expenses for the new marketing campaign are:
a) $8,000 per month
b) $13,000 per month
c) $13,900 per month
d) $9,000 per month