The correct answers are:

Technology developments tend to adversely affect employee relations

and

Technology developments offer significant disadvantages for corporate communications

Rationale: Technology is no longer regarded purely as a threat to job security: it can also support higher-level skilling, options for home-working, cleaner and safer work environments, better employee communications (eg through an intranet) and so on.

'Technology developments offer significant disadvantages for corporate communications' should be obviously false: think of e-mail at one end of the scale, and 'virtual organisations' at the other.

'Technology developments have supported corporate delayering' is true, because IT systems support lower-level decision making and direct communication between strategic apex and operational staff: replacing the role of middle management.

'Technology developments creates risk for long-range product/market planning' is true, because new technologies reduce product life cycles: products and processes can swiftly become obsolete.