Final answer:
It is false that explicit consent is the only form of acceptable consent in email marketing; both explicit and implied consent are recognized, although laws may vary by country. The correct answer is option b.
Step-by-step explanation:
In email marketing, it is false that explicit consent is the only form of acceptable consent. There are generally two types of consent for email marketing: explicit consent and implied consent. Explicit consent, also known as express or opt-in consent, is when individuals directly give permission to receive marketing emails. Implied consent is based on a pre-existing relationship between the sender and the recipient, such as a business relationship or a recent transaction, where emails are deemed acceptable without a direct opt-in. However, the acceptable form of consent may vary depending on the legislation of the country, such as the General Data Protection Regulation (GDPR) in Europe, which requires explicit consent.